diff --git a/app/controllers/api/v1/accounts/inboxes_controller.rb b/app/controllers/api/v1/accounts/inboxes_controller.rb
index 20402b5d1..9b5cafc4c 100644
--- a/app/controllers/api/v1/accounts/inboxes_controller.rb
+++ b/app/controllers/api/v1/accounts/inboxes_controller.rb
@@ -114,10 +114,13 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
   def inbox_attributes
     [:name, :avatar, :greeting_enabled, :greeting_message, :enable_email_collect, :csat_survey_enabled,
      :enable_auto_assignment, :working_hours_enabled, :out_of_office_message, :timezone, :allow_messages_after_resolved,
-     :lock_to_single_conversation]
+     :lock_to_single_conversation, :portal_id]
   end
 
   def permitted_params(channel_attributes = [])
+    # We will remove this line after fixing https://linear.app/chatwoot/issue/CW-1567/null-value-passed-as-null-string-to-backend
+    params.each { |k, v| params[k] = params[k] == 'null' ? nil : v }
+
     params.permit(
       *inbox_attributes,
       channel: [:type, *channel_attributes]
diff --git a/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json b/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
index 14f60eac8..97a4ee2f6 100644
--- a/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
+++ b/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
@@ -482,6 +482,13 @@
       "WHATSAPP_WEBHOOK_SUBHEADER": "This token is used to verify the authenticity of the webhook endpoint.",
       "UPDATE_PRE_CHAT_FORM_SETTINGS": "Update Pre Chat Form Settings"
     },
+    "HELP_CENTER": {
+      "LABEL": "Help Center",
+      "PLACEHOLDER": "Select Help Center",
+      "SELECT_PLACEHOLDER": "Select Help Center",
+      "REMOVE": "Remove Help Center",
+      "SUB_TEXT": "Attach a Help Center with the inbox"
+    },
     "AUTO_ASSIGNMENT": {
       "MAX_ASSIGNMENT_LIMIT": "Auto assignment limit",
       "MAX_ASSIGNMENT_LIMIT_RANGE_ERROR": "Please enter a value greater than 0",
diff --git a/app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue b/app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue
index ebee9474d..5e1e55cff 100644
--- a/app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue
+++ b/app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue
@@ -258,7 +258,22 @@
             }}
           </p>
         </label>
-
+        <div class="medium-9 settings-item settings-item">
+          <label>
+            {{ $t('INBOX_MGMT.HELP_CENTER.LABEL') }}
+          </label>
+          <select v-model="selectedPortalSlug" class="filter__question">
+            <option value="">
+              {{ $t('INBOX_MGMT.HELP_CENTER.PLACEHOLDER') }}
+            </option>
+            <option v-for="p in portals" :key="p.slug" :value="p.slug">
+              {{ p.name }}
+            </option>
+          </select>
+          <p class="help-text">
+            {{ $t('INBOX_MGMT.HELP_CENTER.SUB_TEXT') }}
+          </p>
+        </div>
         <label
           v-if="canLocktoSingleConversation"
           class="medium-9 columns settings-item"
@@ -425,6 +440,7 @@ export default {
       selectedFeatureFlags: [],
       replyTime: '',
       selectedTabIndex: 0,
+      selectedPortalSlug: '',
     };
   },
   computed: {
@@ -432,6 +448,7 @@ export default {
       accountId: 'getCurrentAccountId',
       isFeatureEnabledonAccount: 'accounts/isFeatureEnabledonAccount',
       uiFlags: 'inboxes/getUIFlags',
+      portals: 'portals/allPortals',
     }),
     selectedTabKey() {
       return this.tabs[this.selectedTabIndex]?.key;
@@ -519,6 +536,7 @@ export default {
     inbox() {
       return this.$store.getters['inboxes/getInbox'](this.currentInboxId);
     },
+
     inboxName() {
       if (this.isATwilioSMSChannel || this.isATwilioWhatsAppChannel) {
         return `${this.inbox.name} (${this.inbox.messaging_service_sid ||
@@ -566,8 +584,12 @@ export default {
   },
   mounted() {
     this.fetchInboxSettings();
+    this.fetchPortals();
   },
   methods: {
+    fetchPortals() {
+      this.$store.dispatch('portals/index');
+    },
     handleFeatureFlag(e) {
       this.selectedFeatureFlags = this.toggleInput(
         this.selectedFeatureFlags,
@@ -607,6 +629,9 @@ export default {
         this.selectedFeatureFlags = this.inbox.selected_feature_flags || [];
         this.replyTime = this.inbox.reply_time;
         this.locktoSingleConversation = this.inbox.lock_to_single_conversation;
+        this.selectedPortalSlug = this.inbox.help_center
+          ? this.inbox.help_center.slug
+          : '';
       });
     },
     async updateInbox() {
@@ -619,6 +644,11 @@ export default {
           allow_messages_after_resolved: this.allowMessagesAfterResolved,
           greeting_enabled: this.greetingEnabled,
           greeting_message: this.greetingMessage || '',
+          portal_id: this.selectedPortalSlug
+            ? this.portals.find(
+                portal => portal.slug === this.selectedPortalSlug
+              ).id
+            : null,
           lock_to_single_conversation: this.locktoSingleConversation,
           channel: {
             widget_color: this.inbox.widget_color,
diff --git a/app/models/inbox.rb b/app/models/inbox.rb
index b74a79894..592ac0923 100644
--- a/app/models/inbox.rb
+++ b/app/models/inbox.rb
@@ -23,11 +23,17 @@
 #  updated_at                    :datetime         not null
 #  account_id                    :integer          not null
 #  channel_id                    :integer          not null
+#  portal_id                     :bigint
 #
 # Indexes
 #
 #  index_inboxes_on_account_id                   (account_id)
 #  index_inboxes_on_channel_id_and_channel_type  (channel_id,channel_type)
+#  index_inboxes_on_portal_id                    (portal_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (portal_id => portals.id)
 #
 
 class Inbox < ApplicationRecord
@@ -45,6 +51,7 @@ class Inbox < ApplicationRecord
   validate :ensure_valid_max_assignment_limit
 
   belongs_to :account
+  belongs_to :portal, optional: true
 
   belongs_to :channel, polymorphic: true, dependent: :destroy
 
diff --git a/app/models/portal.rb b/app/models/portal.rb
index 9d36c8217..269f64110 100644
--- a/app/models/portal.rb
+++ b/app/models/portal.rb
@@ -37,6 +37,7 @@ class Portal < ApplicationRecord
            dependent: :nullify,
            source: :user
   has_one_attached :logo
+  has_many :inboxes, dependent: :nullify
 
   before_validation -> { normalize_empty_string_to_nil(%i[custom_domain homepage_link]) }
   validates :account_id, presence: true
diff --git a/app/views/api/v1/models/_inbox.json.jbuilder b/app/views/api/v1/models/_inbox.json.jbuilder
index c87dadec7..a82e63bc9 100644
--- a/app/views/api/v1/models/_inbox.json.jbuilder
+++ b/app/views/api/v1/models/_inbox.json.jbuilder
@@ -17,6 +17,13 @@ json.callback_webhook_url resource.callback_webhook_url
 json.allow_messages_after_resolved resource.allow_messages_after_resolved
 json.lock_to_single_conversation resource.lock_to_single_conversation
 
+if resource.portal.present?
+  json.help_center do
+    json.name resource.portal.name
+    json.slug resource.portal.slug
+  end
+end
+
 ## Channel specific settings
 ## TODO : Clean up and move the attributes into channel sub section
 
diff --git a/db/migrate/20230413085302_add_portal_id_to_inbox.rb b/db/migrate/20230413085302_add_portal_id_to_inbox.rb
new file mode 100644
index 000000000..05f71078e
--- /dev/null
+++ b/db/migrate/20230413085302_add_portal_id_to_inbox.rb
@@ -0,0 +1,5 @@
+class AddPortalIdToInbox < ActiveRecord::Migration[6.1]
+  def change
+    add_reference :inboxes, :portal, foreign_key: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f89f9662b..b9e93c344 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -579,8 +579,10 @@ ActiveRecord::Schema.define(version: 2023_04_18_100944) do
     t.boolean "allow_messages_after_resolved", default: true
     t.jsonb "auto_assignment_config", default: {}
     t.boolean "lock_to_single_conversation", default: false, null: false
+    t.bigint "portal_id"
     t.index ["account_id"], name: "index_inboxes_on_account_id"
     t.index ["channel_id", "channel_type"], name: "index_inboxes_on_channel_id_and_channel_type"
+    t.index ["portal_id"], name: "index_inboxes_on_portal_id"
   end
 
   create_table "installation_configs", force: :cascade do |t|
@@ -918,6 +920,7 @@ ActiveRecord::Schema.define(version: 2023_04_18_100944) do
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
+  add_foreign_key "inboxes", "portals"
   create_trigger("accounts_after_insert_row_tr", :generated => true, :compatibility => 1).
       on("accounts").
       after(:insert).
diff --git a/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb b/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
index 90fbf68c6..f19094b0c 100644
--- a/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
@@ -429,7 +429,8 @@ RSpec.describe 'Inboxes API', type: :request do
 
     context 'when it is an authenticated user' do
       let(:admin) { create(:user, account: account, role: :administrator) }
-      let(:valid_params) { { name: 'new test inbox', enable_auto_assignment: false } }
+      let!(:portal) { create(:portal, account_id: account.id) }
+      let(:valid_params) { { name: 'new test inbox', enable_auto_assignment: false, portal_id: portal.id } }
 
       it 'will not update inbox for agent' do
         agent = create(:user, account: account, role: :agent)
@@ -450,6 +451,7 @@ RSpec.describe 'Inboxes API', type: :request do
 
         expect(response).to have_http_status(:success)
         expect(inbox.reload.enable_auto_assignment).to be_falsey
+        expect(inbox.reload.portal_id).to eq(portal.id)
         expect(JSON.parse(response.body)['name']).to eq 'new test inbox'
       end
 
diff --git a/spec/models/inbox_spec.rb b/spec/models/inbox_spec.rb
index bc1abd501..02122709c 100644
--- a/spec/models/inbox_spec.rb
+++ b/spec/models/inbox_spec.rb
@@ -197,11 +197,19 @@ RSpec.describe Inbox do
 
   describe '#update' do
     let!(:inbox) { FactoryBot.create(:inbox) }
+    let!(:portal) { FactoryBot.create(:portal) }
 
     before do
       allow(Rails.configuration.dispatcher).to receive(:dispatch)
     end
 
+    it 'set portal id in inbox' do
+      inbox.portal_id = portal.id
+      inbox.save
+
+      expect(inbox.portal).to eq(portal)
+    end
+
     it 'resets cache key if there is an update in the channel' do
       channel = inbox.channel
       channel.update(widget_color: '#fff')
diff --git a/spec/models/portal_spec.rb b/spec/models/portal_spec.rb
index 925ec3938..070c2ca6c 100644
--- a/spec/models/portal_spec.rb
+++ b/spec/models/portal_spec.rb
@@ -14,6 +14,7 @@ RSpec.describe Portal, type: :model do
     it { is_expected.to have_many(:articles) }
     it { is_expected.to have_many(:portal_members) }
     it { is_expected.to have_many(:members) }
+    it { is_expected.to have_many(:inboxes) }
   end
 
   describe 'validations' do