To grant access to each customer to only one site, UC should create a permission set and select a permission set for a given site. A permission set is a collection of settings and permissions that give users access to various tools and functions. UC can create a permission set for each site that specifies the site access and the object permissions for the customer users. UC can then select a permission set for a given site in the Experience Builder, which will assign the permission set to all new and existing users of that site.

To make an external user an Experience Site Moderator, two of the several moderation permissions available to assign are Access Experience Management and Manage Experiences. Access Experience Management allows an external user to access Experience Workspaces and Builder from an Experience Cloud site. Manage Experiences allows an external user to create, edit, and delete experiences, as well as manage settings and content for existing experiences.

To share records with Customer Community users using Sharing Sets, you should create one Sharing Set and add the objects to share in the Sharing Set. A Sharing Set is a feature that allows you to share records with Customer Community users based on common account or contact fields. For example, you can share records with users who have the same account ID or contact ID as the record owner. To use Sharing Sets, you need to create one Sharing Set and add the objects that you want to share in the Sharing Set. You can then define the access level and criteria for each object.