you really need a seperate room to keep mother plants so you can take cuttings anytime you wish and ideally the same room could also be used to root clones and to veg them for 3-4 weeks so the 2 rooms are always flowering and are not used to veg at all.
you can get alot of cuttings from a mother plant by the time the mother plant is a few months old it should supply you with more cuttings than what will ever be needed that being said would probably allow for space to have a few mother plants as you will probably eventually want more than one strain.