You can use ADDWSE to add or excluse a specific workstation(s) from a substem.
You can set this up by a device anme and/or a device type,
Then when you do a STRSBS these entries will take place.
To see what you have setup, you can do WRKSBSD QINTER (or whatever sbs you are changing), Then do option 5. Then you can do option 4 or 5.