I agree it's unclear but it can be inferred that the OP wants to write a SMAW-only WPS from a SMAW/GTAW PQR. The way I understand it is that he/she wants to backgouge a joint and use SMAW to back weld. If it's backgouged and back welded I assume it's not an open root, which would require a new...
Assuming all other variables remain within the parameters of the PQR you may write a WPS for the SMAW. You might have your own reasons to write a new WPS but it may not be necessary... you can use your combo WPS for SMAW only. See QW-200.4. One thing to keep in mind is that you will not be...