On the Domain Configuration page, you can see the following components:
Domains in Catalog-> where you can select a catalog under which you would want to create a domain.
Import-> Allows you to import one or more domains from the selected catalog. For more details refer to Domain Data Transfer: Import & Export.
Export-> Allows you to export one or more domains from the selected catalog into structured files. These files can be downloaded and reused to replicate the domain in other catalogs. For more details refer to Domain Data Transfer: Import & Export.
To configure a new domain for the selected catalog follow the below steps:
On the Domains Configuration page, select the catalog from the drop-down.
To create a new Domain, click +Create New Domain for Selected Catalog.

You will land on the Create New Domain page.
Enter the Domain name which must be unique.

Enter the description for the domain you are creating.
Select from the drop-down from Special Display Location in 360 screen, if you want the domain section to be seen as an individual tab or common tab on the product 360 page.
Is Global-> Enable this toggle option if you want this domain to be global across the catalog. By default, the toggle is disabled. When you select this option, please note that it will take a few minutes to add.
Restricted Value List-> toggle this option to yes if you want to restrict to consisting of domain values only when associated with SKU and no if you want to add values.
+Add Meta Tag(s): Select the meta tag to be associated with the domain from the drop-down list. Here, you can set the relevance for the meta tag being associated to a domain for use in PCC or an external ecommerce platform like WooCommerce / BigCommerce / Shopify.
Similarly, to select system defined metatags or other metatags that you have created, select PCC and a list of all such metatags will be displayed. You can associate multiple meta tags, click Add More to add more meta tags for the domain.
Details about meta tags and how to add new meta tags are detailed in the Adding an Attribute Metadata section.

+Add Meta Attributes: Select the meta-attribute to be associated with the attribute from the drop-down list. Type the meta-attribute value as required. Details about meta-attributes and how to add new meta-attributes are detailed in the Adding an Attribute Metadata section.
Click Add Domain, you’ll land on the Configure Domains page with the new domain listed and on the right, you can see basic domain details.

Update Domain
Click on Edit under Ovreview tab, and you can update the domain information as needed and click on Save Changes.

You can scroll under the Overview tab to link digital assets.

On the right the there are three tabs as shown below:

Overview-> you can view all the basic domain details that was set up.
Attributes-> View or add an attribute for selected domain.
Records-> View or domain records.
Add Attribute for a Domain
Steps to add attribute for a domain:
Select the domain from the list for which you would like to add an attribute.
Select the Attribute tab and click Add Attribute for Selected Catalog.

You’ll land on the Domain Attribute page.

Enter the Domain Attribute Name.
Select the datatype from the drop-down list which consists of values such as string, integer, decimal or datetime.
Enter the minimum and maximum length for the property name. If you have selected the datatype as integer only then it will display min & max value.
You can toggle to enable any of the following regular constrains:
Is Required-> Turn on the toggle if this should be a mandatory attribute.
Enforce LoVs-> Select this option to restrict the LoV defined in schema.
When you enable the toggle, you can enter the List of Values on the right as shown below:

Allow Multivalue-> Turn on the toggle if the attribute needs to have multiple values.
Enforce Datatype-> Select this option to validate whether the domain value populated for a SKU adheres to the restrictions defined by the datatype for the domain.
Once all the values are entered, click Add Domain Attribute.
You’ll land on the Configure Domains page with the added Attributes.

To add a new attribute or edit the existing attribute, click on Add/Edit Attributes.

Where the list of attributes along with their details pop-up.

To add click +Add New Attribute or to edit just update the existing details and click Save Changes.
You can clone the domain attribute and also delete the attribute as highlighted in the image below:
Note: If a attribute value was set up based on the attribute constraints, but if the user goes back and changes the property constraint which makes the attribute values incorrect now. For such cases, the validation error gets displayed and so the update/add domain property value will not be submittable if there is at least one validation error as shown below.