...
You can add a PBAC attribute to an existing PBAC membership policy. Click on the Name link of the PBAC Membership policy you want to add an attribute to. This will open the view-one page of this PBAC membership policy. Select the Attribute Conditions (Field Types) link.
Click on the + icon to add an attribute to this policy that you added to the person earlier. Search for the name of the PBAC membership policy attribute type and select it. Select the two values ( sales and IT) check boxes. Select the checkbox If matches all values. Click Save.
The attribute is now added to the PBAC membership policy type.
...