m0useanswered grow question a year ago I agree with GGST, If the clones are established you can do whatever you want with them they act like a baby photoperiod plant at that point. LST and HST is on the table.
If they are fresh cuttings, you could top them if you wanted, don't know why you would, more stress=more failure. Most just trim the leaves down and put them in a cloning chamber to get some roots on them.
Good Luck!