I know this question has been answered but I thought I'd elaborate for kicks.
Like the other 2 said, you must leave the plant tied down in order to reap the benefits of LST. By thing the plant over to a 90 degree angle you allow the light to be evenly distributed amongst the whole plant, thus causing each branch to "think" it's the main cola. And eventually those small side branches will in fact become main colas, so long as you keep each branch at equal height. To maintain that level canopy you may have to tie other branches down/over if they start to out grow the rest of the branches.
Hope this helps. Good luck !