Inserting form with conditional logic to multiple tables

I’m generating a Bootrstrap 4 from a database insert. That’s a great feature btw! Is it possible to add this logic to it?

1. Make a select option available only when the difference between of two date inputs are more than year.
2. If that select options gets checked, dynamically add as many number input fields as there are years between the two date inputs.
3. On submit, save some input fields to one table and other input fields to another.