Re: new bait hives, have old comb
"need some guidance.. should i use LGO in bait hives or just the old comb or a combination of both?"
One old frame and 3 or 4 drops (no more) of lemon grass oil. Refresh the oil once every 7 to 10 days if its convenient.
"should i place the bait hives away from the TBH?"
I would like it to be about 400 yards away from existing hives, but many (if not most) swarm trappers would disagree with me, and bees will move in close to an existing hive.
That is, unless your bees are Russian.