In Rare **Forms**: How to use Primary Key a Single Select / Drop Down Menu in a Form?

[M_L]

Hello,

Bottom Line Up Front: I would like to know, how can I use my table's Primary Key as a Single Select / Drop Down Menu option in an Airtable Forms question. 

Backstory:

I am creating a "Sign Up Form" in Airtable to allow Applicants to schedule themselves for my available appointments in the Appointments table. In order to link their Applicant Table (screenshot #1) record with their Appointment Table (screenshot #2) record, I'm planning to:

1) List the Appointments (Primary Key from the Appointment Table) as a Drop Down Menu in the form so they can select 1 to schedule. 

2) Have the Application # included on the Form, and prefilled through the unique form URL I give them, which will enter their Application # in that field on the form automatically. This will help link their Appointment with their Application.

How can I do this???

TIA!

ML

Screenshot #1: Applicants Table

Screenshot #2 - Appointments Table

[Mike_AutomaticN]

Hey @M_L! If your tables are already linked via a linked field, by having such linked field in your form that alone will already show the dropdown of the existing records in the linked table as a dropdown (showing primary field). I might be missing something. Could you please provide further context?