Hi slowmo77
If singlecola style is what your hunting. I got a (sounds like) good advice from former overgrower.
First you need to find a strain that suits this technique - one that doesnt branch too much. Then you start bloomcycle about 4-6" tall and 10 days into floweing you cut right after the first set of leaves on each branch. This should make the sidebuds form up the sides - like a single cola. It might be cheating a little - but for my concern its most about letting all of that lumens the best way to all of the plants.
Good luck
P.S. Im searching for the strains that suits this, by now my SensistarxS1 and PPP looking like thay have those abilities.