Reducing value list entries as members are selected
I'm looking at the FMPro template (Business projects/event management) and with say 100 contacts, as you add contacts to an event, I want the contacts list to display only those not already at the event. Initially the list would be all 100 names, and having added one, the list is now 99 names long. this should avoid double invites etc, without validity checks etc.
I may have missed something obvious.... I have a thick skin so happy for any advice.