About topping i think :S

Ok Guys here is my problem i have a pc grow what i wanna do is make my plant FILL the pc not just grow strait up how would i go about doing this ?

if u need pics of the grow check this
https://www.rollitup.org/indoor-growing/275563-first-grow-cfl-og-kush.html

yea topping would work. id try LST might wanna search that.....