Put troops on a cycle

I was thinking that say you train all archers you can hit a cycle button like on the side and that troop would keep training until you took it off the cycle but it would only work if you hade a consistent troop like all archers or all barbs and so on. It was just on my mind because sometimes I forget to retrain my troops so thx for reading this and Clash on!!!

I can't be sure because I do not really understand but IF I am understanding correctly, it is on the ruled out list