The Group Nicknames feature on Planniac is helpful when you're scheduling activities at the same time for several rooms that are related.
Here's how to do it:
Go to the Guests page
Select a room that's part of a group booking
Go to the Groups tab
Give the group a nickname
Save
The group nickname should now be applied to all the rooms on the same reservation
After setting up a group nickname, when activities for that group are booked, they will be grouped together on the Planns page under the group nickname.