Get the difference in users between two fields

[ccollins]

Relevant, might help:

Generating an user list by subtracting other users lists

I need help with a formula for a button: I have 4 relation to users field in my meetings: Expected, Present, Informed absent and Non-informed absent. For the expected I already have a button that generate the list of expected people. Presents I usually add manually, so as Informed absent. Now I wanted to create a Generate Non-Informed Absent List that would take the Expected users list, subtract the presents and the informed absents and get to a result of Non-informed absent. For example, use…