You need to keep the bees on the frames when you transfer them, as they will be the nurse bees to look after the brood.
We give every body a dusting with icing sugar, new frame and others, they all smell the same and when we have finished licking the icing sugar off we are all mates, hopefully.
I like know where the queen is in the donor hive, find her and put the frame aside, so when you select your frame you don't transfer her as well.
Sorry if I am telling you how to suck eggs!