Overview types determines the key points discussed in a RAR on the Overview page. 

Click “Add” at the top of the page to add a new Overview category into the standard RAR packs.

This will load a new window, in which you can define the overview type and select whether it is a priority deliverable or not.

Use the handle icon before the name to rearrange the order of the overview types.

Selecting 'add action' will allow you to reference this Overview type when setting actions within the RAR.