Filtered Value List That Excludes Portal Values

[bright_guy]

Anyone know how to create a filtered value list that excludes values that have already been selected?

Here's the context... A Meeting TOG includes Attendees and People, as shown in screenshot.

The Meeting layout has a portal to the Attendees, and the portal contains a popup of People.

I'd like the popup to show all the People records, except those that are already in the portal.

I've tried several filters, but I'm stumped.

Thanks,

=L=

_____

Leo Di Croce

[comment]

Please state your version. Better yet, update your profile.