I was on the phone with a Marritt rep, and she combined all of the Marriott and Ritz Carlton accounts in my household under a bunch of different names. Which included qualifying nights, free night awards, anniversary nights, upgrade certificates, vouchers, Status ect.
Make sure to combine what you want to combine before you link your Spg account. Once you link your Spg you can't combine accounts, and there is no way to undo it.