Ours grow in pots in trays but up a string, wound around every few days, so when they get to the apex of the GH, I pinch out the tops - whatever trusses are there - say five or six, then tie the whole lot up with string so they don't start to fall all over the place.
I do the same outside but as they're up against a wall, they finish up shorter, but still cropping!
I've noticed that the trusses seem to have started further up the stems this year, possibly because of the hot spell we had a few weeks ago, when everything looked weird! And also, the side shoots don't seem to be as prevalent this year as well!