How to Update empty Record

How to assign data for the fields in the record in the form, if this form do not contain yet any records?

I have two forms. I want to modify some fields in one of them, after submitting another one.

If the first one already has records - I can modify them.

But if the first one do not have any records - I can not.

So, is it possible to create the record from another form (update empty record)?