Laravel Nova - How can i do custom logic on Create/Update

I would like to create custom Create/Update logic for one of my Nova Resource. I have been thinking to use Custom Tools to accomplish what i wanted, but i don't want to give up the excellent work in the Index page and rewrite it all myself.

My use case:

• I have an input that can define how many record to be created recursively.
• I would like to place a morphToMany input at the form.

via Chebli Mohamed