Groups are used as a method to categorize attendees/users in an event. By merging the two groups together you can create one unit/group in the event.
How to merge groups
Click on the "People" tab in the admin panel of the event
Click "Groups"
Select which two groups you want to merge in the event
Once selected click on the "Merge" option
From here you can provide the new "Group name"
Once the "Group name" is provided you can then apply the "Rules from" option to that group from this drop-down
Once this has been done click on the "Save" option and it will be saved in the event accordingly
