dont really understand what ur trying to accomplish . but i belive ur mixing up growing methods with harvesting .
first , i think as far as i can tell , u want to regenrate the plants ? so ull harvest , and turn the plant back to vegging and then start the cycle all over again
with the SAME plant . to do this , u need to cut about 2/3 of the plant , U MUST LEAVE SOME BUDS ON IT , and turn the lights back to 24-0 for a few weeks
then start the vegging proccess all over again .
this is not a guide , and not suppose to be one , just a basic idea on how to do this . please read more about regenerating the plant .
if u just want to regular harvest it , meaning ull get all the bud and throw away all the leaves and stem .
then u just cut the plant at the bottom , throw away the soil and everything left in the pot .
then cut ur buds as clean as u want . good buds are without stems and leaves at all .
FIM , Topping are growing methods , the point of them is to cut away the top of the plant and produce more main colas.
Topping - cutting the very top of the plant , should produce 2 branches out of the cut.
FIM - cutting the top of the plant , not too deep as Topping , and it should produce 2 branches and more , out of the cut.
checkout the first and last Stickies for guides
https://www.rollitup.org/advanced-marijuana-cultivation/