How to create items based on a submit form?

Hello,

I have done my CRUD to make events, and inside that there is a relation to create "inscriptions", for each inscription I made, i want to create "4 quotes" on the table "quotes", how to do that?

Let's say:

- events id, name
-inscriptions id, client_id, event_id
-quotes id, value, date

Once i create inscription i want to create different quotes.

Thanks