If you delete groups in threads they will not removed from the table. They still exists as empty and disabled groups in the table. In threads you dont see them anymore. But if you go to PP and say import/resyc groups from host all groups including the empty ones will pulled. Its an little issue from PP and Chuck say he will look into it next weeks.
I let them in my PP but revoked any rights. Under PP 5.61 and Threads 7.2.2 this worked for me.
I'm not sure what happen if you try it under 7.3.b4
Backup your PP tables first so you can go back if you run in trouble.
