When you save an existing project, InForm will save a backup of both the .bas and the .frm files, in the same folder as the originals, with
-backup added to their name. You can just rename those and continue using them.
However, in the upcoming version of InForm I've made it a bit smarter about reusing existing code when editing an existing form. If you'd like to test the new feature, enable auto-updates and choose the development channel:
You should get a notification prompting you to update InForm. After you're in the latest development build, you will see that editing existing projects will be way smoother.