If transgender Boys can take hormones to get breasts is it possible for a Girl that wants to be a boy to take hormones to reduce breast size or maybe get rid of it but mostly just reduce to like a B cup to an A Cup?

no

Explanation:

transgender woman can grow breasts while on hormones because they are adding more there, but transgender men can not take away what is already there wihtout surgery, unless they start hormone therapy before theyve gone through puberty, which would only really be estrogen blockers.

which of what? i am confused