In order to add an additional member to a membership, an additional membership type first needs to be set against the membership band.
To do this:
Click Membership, then click Schemes.
Select Bands.
Search for the band that the membership belongs to.
Select the Details tab.
Scroll down to Additional Member Types and click the plus icon.
Enter the information and click Save.
Once created, return to the membership and click the plus icon under the Additional Members sublist to add a new member to the membership.
📌 Note: Additional members cannot be edited but they can be deleted. Changes can be applied by deleting the member and adding them again with the updated details.