12/12 topping? or FIMing?

If growing a plant 12/12 from seed, would it be possible to top this plant?

the plant will get fucked up. you should be 18/6 until it's at least 8-12 inches tall. topping or fiming is done when the plant is between the size I stated. I myself super crop and fim

Yes, you most certainly can. I would advise low stress training.