Yes you can take starts from your flower cycle.....I have taken a lower inner bud and turned it back into veg growth.
the bud will root in the normal rooting time for a clone ...then about 2 weeks after rooting a limb will start to grow out of the bud.......lights on 24/7
I believe this is called Jumping a Generation .....when you allow the plant to go through its entire life cycle then reveg it from bud
waste of time !
all the preserved energy is going into flowering, not vegging. So if it even took root, it would preflower instead of grow, you would send it to re-veg, taking way too long if it even worked.