To create or update a Database when a form is Submitted, you can set up an Insert / Update Database Record Action which will insert a new, or update an existing database that is connected to your form.
Firstly, you will want to make sure that you have a database record that is connected to your form. if you're unsure of how to add a database lookup to your form, there are articles at the bottom of the page while can assist with that process.
Once you have set up the lookup database in the form, then go to Forms > View Form Templates > choose the edit arrow for the template you would like the action added to > Actions tab > + New Action. Then you can select Insert/Update Database Record in the Action type dropdown.
Once you've set up the Action the way you would like it to work, and click on Save Actions, then this will be set up to use for this form template.
Related articles:
- Using Lookup databases in Forms
- Sending database information to form fields
- Adding a filter to your form lookup database
- How do I name Form Action tabs?
- What are Form conditions?