I have a picklist on Opportunities called "Demo Set By", which lets us recognize the Sales Development Executive who set up a demo (not the same as the owner of the opportunity, which is the Account Exec.). As you can imagine there is a certain amount of turnover among our SDE team, so we now have a long picklist of names, most of whom are no longer employees.
It seems I can't delete names from the picklist without losing the historic data; elsewhere, I've read that when you go to delete a picklist value it asks if you want to replace it with another value, but I do not get that option (maybe it's because I'm on Professional Edition?).
Is there a way to just deactivate the values or hide them from the dropdown on the object detail/edit pages?