You can now create Customer Groups for Metric reporting. To create these customer groups you will need to:
1. Go to Settings > Admin > Payments & Finances > Custom Groups.
2. Click 'Add Group'.
3. You will then see a pop up which will allow you to give the group a name and type in the names of customers that you would like to add.
3a. Once these have been added, you can also click on the number under the column 'Members' to view who is in this group.
4. Once the group has been created you can then go into Metrics to view data on these customers.
Note: The Customer Group will be visible and can be used for filtering purposes when accessing the 'Revenue' and 'Orders' tabs.