can you add different school plays in a created playbook?

hi can you add a different schools play to a created playbook you are using? right now i’m playing with washington’s playbook because i like their multiple system offense however i wanted to create a playbook and add plays like the fleaflicker and such to it. will i be able to do that and if so how do i do it, and if i can’t then how does one go about that, would you have to create multiple playbooks?