Good afternoon.

I'm trying to customize the signup page for new webpage customers.

I made a custon model "schools" with a list of all schools in our province. Then I made a model "fieldsOfStudy" with all available fields. 

with a custom app, I can now, in a form view, assign fields of study to schools with a many2many connection.

I added 2 many2one fields in the form view of the contacts app. and now I can assign a school from my list, and a corresponding field of study to that contact.

now I wish to create a custom signup page, where new customers have to choose a school, and their field of study, based on the lists I created from the models.

these are required and can't be entered a custom value by the client.

I tried some existing apps to modify the signup page, but 1 i tried only lets me add a select choice of fields like phone, city, ....

another more advanced, only lets me choose Base fields from the user model, but not my 2 fields school and field of study.

Any idea how i could accomplish this?

thanks in advance