cut a branch or cola off at a 45 degree angle, with a sterile axe if possible lol and then trim off some of the excess branches on that cola, trim SOME of the fan leaves a bit then dip the stem into a cloning solution. take that stem and put it into a jiffy puck or root riot. Spray the little bugger a few times with Ph'd water and if possible put that cutting into a tent with alot of humidity or take a 2 liter coke bottle and cut off the top and use that as a humidity dome. try and keep the light far from the plant, because humidity is inversely proportional to temperature (as temperature increases humidity decreases). this is done because the plant needs food and water to make rooting structures, and because there are no rooting structures the plant cannot intake food or water (with the exception of foliar feeding, but no one wants nasty nutrients in their bud).
ive heard of the lick and stick method, where instead of using a rooting solution they literally lick it and that causes it to root, but idk if it works because im not dumb or broke enough to do it lolol

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but i think thats pretty much all i can remember about taking cuttings, ive had a cutting of a sweet deep grapefruit take without using any rooting solution, but you need to have humidity or else the cutting might die.
I also just want to say i dont think the cutting will take in this case because the plant is quite far in bloom. but i hope it works out for you!
good root/clone vibes your way bro!
-Sherlock