Sorry Stinky...I didn't even think to mention taking the lower branches for clones, but he did specifically mention topping.
My bad.

Hudson...you can put the unsexed adult under 12/12 light to determine sex, prior to taking clones. Takes a week or so to start seeing sex, depending on strain and maturity.
Once sex is determined, you can switch back to 18/6, or whatever your veg cycle is. Takes another week or so to revert back to full veg. A total of two or three extra weeks for this process, but you'll know which plant(s) to take clones from, and which are the males. :thumbsup:

Do you have seperate veg and flower rooms? Just curious, because you can't veg and flower in the same closet without some serious lightproofing and ventilation handywork.