No. A customer can only have one active membership at a time. Moving someone from one tier to another is an edit to their existing membership rather than a second one, so you'll never end up with two sets of perks competing. The change is recorded in the **Membership history** on their customer record, along with who made it and when. If you need a customer to have a combination of perks, such as a discount and an allowance of included hours, put both on a single tier. A tier can carry every perk type at once. See [[Assigning Members]].