Rolling Subs over into new venue, GA Seating

Hey all. 

We're rolling over one of our 4 series packages and we're adding in a new venue, General Admission by Pricing, for one of those performances. I'm wondering if there's a smooth way to roll over subs into their respective zones based on the pricing of their tickets.

I've searched through the forum a little and I see that a suggestion is to create a dummy performance and then to manually move the patrons into the package once their seats are paid for. I was wondering if there might be another way since we're seating GA by price, or maybe to have the "dummy performance" idea explained in a little more detail for me.

Thanks everyone!