The Secure Resources tool differentiates visually between resources that belong directly to the current resource group and resources that belong indirectly. Resources explicitly added to a resource group have direct membership. Resources that belong to a resource group that was added to a resource group have indirect membership.

For example, you want to have two resource groups:

In this example, the Address base object is unavailable when you edit Resource Group A. You must edit Resource Group B to edit the Address base object.