I’m looking to build a system where an individual can select their name from one dropdown, then enter a date, and from there, a second dropdown will populate with a list of professors who are available to arrange a meeting with. In order to cap the number of attendees, once a professor has been selected for a given date 10 times, their name will no longer show up in that second dropdown for future rows. Is this possible?
Hi @ACD ! Welcome to the community
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It should be possible 
Without more info about your doc, this is a little something you should be able to play with to get the desire result
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It uses 2 Lookup fields. The one in [Lessons] does, I think, what you are looking for
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The Lookup in [Prof] is a “Referenced Lookup”.
There are 2 different examples in this doc that work together :
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Prof [Lookup] 1andLessons [Lookup] 1 -
Prof [Lookup] 2andLessons [Lookup] 2
There might be other ways to do this though
: It’s just an idea 
That did the trick. Thank you!
@ACD Lol
I’ve withdrawn my post earlier because it didn’t completely answer your problem and I’m actually looking at a more complete solution
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Edit : Just in case this is my final take on this 
Using more Select List than Lookups
A little bit more complex but it seems to do the work this time 