Couple of ways:1) Use Cmd-, and a menu will pop open with an option "flaps..." (But this method as I recall, was discouraged by Bert as it shows other "Non Etoy Friendly" options.
2) Make a Copy of the the Flap from the Home page and drag it into the Supplies Bin. Then you can drag from the Supplies Bin and put in another project. You will need to delete all the information in the flap, but this may be the preferred way to document for 4.0 as it avoids exposing the other items from CMD-, menu and shows folks how to use the Supplies Bin to copy objects to other projects.
Stephen