Yes, you may.
See QW-403.5(c) which reads in part "when base metals of two different P-Number Group Number combinations are qualified using a single test coupon, that coupon qualifies the welding of those two P-Number Group Numbers to themselves as well as to each other using the variables qualified."
Also, as an example see Interpretation IX-15-15:
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Chetan
Sent: Thursday, August 13, 2015 12:53 AM
To: materials-welding@googlegroups.com
Subject: [MW:23293] WPS Supplementary essential variable for Impact
Dear sir,
I have PQR for P1 G1 to P1 G2 as per Impact test requirement G no. is supplementary essential variable.
My question is can I made P1 G1 to P1 G1 & P1 G2 to P1 G2 wps using same PQR without change in other essential & supplementary variable.
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