>I have a table of 10 user positions. Of those 10, only 3 positions can be used once. My combo box lists all 10 positions, once the user selects one of the Primary positions (only used once), I want to remove that positioni from the list unless they choose that re-position that particular user.

If your combo is bound to a cursor, (not the base table), you can delete the selected row in InterActiveChange() method. Refresh the combo and the deleted item won't show up. You can recall the row if you want it to appear again.

If the combo is populated using AddItem() method, just remove the item using RemoveItem() method.