Group multiple select in form

[javage]

Hi, 

Let's say I build a form on top of a table with fields

Classroom | Student name | Favorite classmate

I'd like the form to allow each student (indexed by Student name) to pick their favorite classmate from a dropdown list that contains only the students in their classroom (ie. the Student names pertaining to a group defined by the field Classroom). 

I'd like this to be able to scale to a few thousand classrooms, so creating new fields is not an option. I'm an Airtable noob but experienced engineer. 

Thanks in advance! 

[TheTimeSavingCo]

If your desired workflow is to dynamically filter select field options based on the users selections within the form, I'm afraid that's not possible with Airtable forms and you'll need to look into a third party tool like On2Air forms, miniExtensions, Fillout etc