you don't even have to do all that... just add one or as many plays from the formation as you can (each one SAYS you've added a new package)... then just back out to the previous menu where you view your plays. When you go back into add plays, the package issue will be correct.
So for example, if you added 10 new plays which actually WERE contained within 1 new package, it will show initially of course that you added ten new packages... so you'd almost be out of space (what is it again? 26 total or something?). But after you back out and come back in, there will only be 1 package added to your original total.
It's just a little glitch. No need to even save & reload your PB.