As a Catalog admin, if the Storefront Theme Editor has been enabled for your account, you can create custom email branding for your catalog and subcatalogs using HTML.
If custom email branding is not created for a subcatalog, it inherits the parent catalog email branding.
Note: When the parent catalog has the Modern Storefront enabled, all subcatalogs automatically inherit this setting and its branding elements such as logos, colors, and favicons, which cannot be customized at the subcatalog level. However, if the parent catalog uses the Legacy Storefront, subcatalogs can enable the modern Storefront independently and manage their own branding settings.
Open Admin
Click the User Name drop-down menu [1]. Then, click the Admin link [2].
Open Catalogs
Click the Catalogs tab.
Open Catalog
Click the catalog name link.
Open Customizations
In the Catalog settings drop-down menu, the Catalog Info page displays by default. Click the Customizations link.
Customize Email Branding
Click the Email Branding link [1].
To customize the email header, enter HTML in the Custom Layout HTMLHeader field [2].
To customize the email footer, enter HTML in the Custom Layout HTML Footer field [3].
Click the Save button [4].
