How do I organize the files for multiple forms applications?

I am using Oracle Forms 12.2.1.4 on Windows.  I will be deploying multiple forms applications and I would like to keep the files separated.  My initial thought was to use subfolders within a specified "FORMS_PATH" location.  However, it does not recognize the forms files within the subfolders.  What is the best practice way of separating files for each forms application?  I wanted to avoid adding a path to the "FORMS_PATH" for each application.