Before you can assign access to members of user-defined custom dimensions, you must select the Apply Security check box on the dimension’s Property tab. See Enabling Access Permissions for Dimensions.
To assign access to members or business rules:
Select the member or business rule:
For members: Select Administration, then Manage, then Dimensions, and then select the dimension and member.
For business rules: Select Administration, and then Business Rule Security. Select the folder containing the business rules, and then select the business rules.