I use SNDTCPSPLF to copy spool files from one output queue to another.
Oops. A bit of clarification: I use LOCALHOST, our *LOOPBACK interface, for the remote system (RMTSYS) parameter.
If TAA Tools are on your system, check out DUPSPLF.
If you do not need 2 copies you can just move it to the other outq. If you only wantit in the other outq you can OVRPRTF in the job CL program and the job will produce in the other outq. Otherwise SNDNETSPLF to a user defined for the other outq.