You can add a client to a group in three ways.
1. By group editing
Select a Group in the list or from the calendar. After entering Group Details, select Class Edit.
Then you will see the Participants section at the end of the form. Add clients of your choice.
** from this view you can also configure their individual prices or payment methods.
2. From the Participants list
Select the clients you want to add to the group. Then select Mass action, Add to group.
3. From the view of a specific customer
While you are in the profile of a specific client, select Actions on the client – Add to group.
Additionally, in the appearing window, you can add the day from which you want to add client for the given class.