Document Groups are normally set up by your Implementation Specialist and give you the ability to attach documents to the document tab on the event booking page.
There are four options, Event booking, Picture, Profile and To Do.
Each option is set up separately
If you need to add one:
Press new. Choose which role you would like to create and give it a three letter code.
Include a description and tick the file extensions you want to be able to use.
Press save.