A Foliobook portfolio can be copied to other iPads.
This solution requires Foliobook 3.9.1 or Foliobook 4
1) Foliobook's built in backup and restore mechanism can be used in conjunction with file sharing using the Finder in recent versions of MacOS or on older versions or Windows via iTunes filesharing.
The following video tutorial shows how backup and restore works. Backup up means a Foliobook project can be backed up to a file that is copied to a computer. That file can then be copied as desired and restored to other iPads.
To copy Foliobook to another or multiple iPads, each iPad must have a copy of Foliobook installed. The outline of the process is then as follows.
1. Backup the Foliobook portfolio using the F->Sharing->Backup menu.
2. Use iTunes to copy the portfolio project file (with suffix .foliobook) to your computer.
3. Use whatever means you like, Dropbox, YouSendIt, DVD etc. to copy the file to other computers if relevant
4. Use iTunes to to copy the portfolio project file onto the other iPad or iPads
5. Use the F->Sharing->Restore menu to load the Foliobook project onto the other iPad.
IMPORTANT : Currently Foliobook can current only host one portfolio. As a result any existing portfolio will be overwritten when restoring a Foliobook project. As a result, this method of sharing portfolios is not suitable in every occasion. It is best to perform a backup of whatever is already in Foliobook, before commencing a restore operation.
2) Alternatively if you make an iCloud backup, or an iTunes backup of your iPad, then restoring that backup on another iPad will preserve all of the data in Foliobook.
For information on how to handle this method, please refer to the Apple link
You can also find extensive online resources through search engines.