Thanks for the response.
From what I have here with this company, there are PQR's that qualified the GMAW process for 3mm to unlimited thickness of plate. From your comment, am I to conclude that when writing a WPS for a SAW process, one needs to submit two WPS? If so...that's not good news for this company here. They've been operating for years with just one PQR, to allow them a GMAW backing with SAW root, fill cap. I promise you, I'm not one to say "that's how it's been done...therefor it's the right way."
How would one note that in a WPS "See this WPS for the start of this weld?"
As for what needs to be qualified:
At current I'd like to find a PQR that will qualify the welding of 3mm-Unlimited thickness plate. All of these PQR's will require CVN, with that, I know if I tested a 27mm plate that qualifies me for 16mm - Unlimited, as well I know if I qualified a 1/4 in plate, that would cover me from 3mm to 5mm. But what about 6mm - 15mm, that's what I'm hoping to figure out.
The backing is GMAW, the root, fill and cap is SAW.
If I'm not providing the information you're looking for, could you objectify what additional information your seeking?