short form to long form

Yes it's possible.

You'd configure your short form to redirect to a page containing your long form. You'd then configure that form to pass field values to the redirect page via the query string.

You would then configure your long form so that the fields you want to populate from the short form can be populated dynamically. The fields would then be populated using the values passed to it in the query string by the first form.

There is a tutorial in the How To section of the Documentation that discusses how to populate fields dynamically via the query string that you can access after you purchase.