Mac,
You misunderstood and I probably wasn't being clear. All devices are ultimately calculated in the same zone. For example, at a concert with no comm, and one active zone for coordination which has IEM's and wireless mics, gtr packs etc... If I have trouble finding frequencies for my IEM's I will create another zone and coordinate my IEM's there. I will move the IEM's back into the active zone (with all the other devices) for the show and recalculate the microphone/all other assignments leaving the IEM's alone. This gives IAS some space to calculate the devices I would like to keep the most robust, the IEM's.
I prefer this method to deleting devices, calculating what's there, adding deleted devices back because it saves time labeling the devices again. Hope this makes sense.
If you don't do what Ike suggests this will not result in a good coordination. The devices you coord in a different zone are not coordinated with the original zone, only checked for direct hits, not IM products. When you move them to the original zone you are accepting all those IMs. By locking them and doing a re-calc you will be checking them for IMs against your imported freqs.
Mac