Adding 2nd unit subscription mid-year?

We’ve got 8 months left on our TT subscription.

We’re considering opening up a 2nd “unit” to administer multi-Troop events and communication.

Can we still qualify for the 2nd unit discount price, or must they be paid together?

In my experience they need to be paid together. We have a Troop and Pack by same charter and the Troop renewed but forgot about the dual unit discount and didn’t do the Pack so then we had to do the Pack separate at full fee.