Hi Matt,
Just to ensure I'm understanding you correctly, you have several dropdown lists that are linked to selection lists from the Customer table. However, when you want to add another dropdown field to pull from the same table, the field containing the choices (Step 3 of 3 on the Dropdown Wizard) only holds an empty value to select from. Is this correct? Or are you referring to the selection list being blank when editing your dropdown field on your custom screen?
The only time I've seen this happen is if there exists duplicates of FullName in the table being referenced, regardless, you should see RecordID as one of the fields to choose from. Try regenerating the Entity table, the Customer table, then the table where you're adding these dropdown fields. In order to regenerate a table go to Customize > Tables/Fields > click on the table name, i.e. Entity > then click Finished Editing Fields. But prior to doing that, make sure no one is currently editing any screens or tables in your account.
In regard to your second post, no, the two screens don't have to hold all the same fields. Just keep in mind the records are all being added to the Customer table, however, Leads are separated via a specific field. Both screens should contain the same Required and Unique fields but it's good practice to keep them similar incase you ever convert those Leads to Customers down the road. Different fields on those screens should not affect the behaviour of dropdowns.
- Ashur