The following article will show you the steps to create an optional folder.
1) Open the job you want to manipulate.
2) Go to the estimate screen.
3) Create a new folder.
4) Click on 'All Estimate Items'
5) On the right side of your screen, under 'Estimate Options', click the dropdown under your new folder.
6) Select 'Print on Document'
Your new folder has become an Optional Folder.