Manage Child Site Groups

In case you are managing a large number of WordPress sites, it would be very useful for you to split sites into different groups. Later, you will be able to make Site Selection by a group that will speed up your work and makes it much easier. One child site can be assigned to multiple Groups at the same time.

Create a New Group

Login in to your MainWP Dashboard
Go to the MainWP > Sites > Groups page
Click the Create New Group button
Enter a Group Name in the provided field
Click the Save Group button in the same row
Click the Edit Group button for the group
Select all sites that you want to add to this Group
Click the Save Selection button

Edit a Group

Login in to your MainWP Dashboard
Go to the MainWP > Sites > Groups page
Find the Group that you want to edit and click the Edit Group button
Add/Remove sites
Click the Save Selection button

Delete a Group

Login in to your MainWP Dashboard
Go to the MainWP > Sites > Groups page
Locate the Group that you want to delete
Click the Delete action in the corresponding row

Source Article: https://kb.mainwp.com/docs/manage-child-site-groups/