Hi,

Need to created records in the same model ? If so adding a one2many inside the form will helps ?

If you need to create records in multiple models, better to override the create method of a model and then create records in the another models from the create function.

Reference:

1. One2many:  https://www.youtube.com/watch?v=QOyFQOlroFc&t=54s

2. Override Create Method: https://www.youtube.com/watch?v=_-fs_NBeOLI

3. Delegation Inheritance: https://www.youtube.com/watch?v=CkUulwB6k3o

Thanks