Saving to a sub

We have several lights on. Then put up a new light that we want to save (only this) to a sub.

Using Record Sub # will of course on repaly show all the lights we had up at time of record.

But I only want the last one we put up. I tried using Record Only after making sure that , that light was the only one selected.

But on replay all the lights came on! 

Question: If we have a mixed bag of lights up and only want to save one to a sub, how do we do that?

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