The supplied manual doesn't describe how to assign advanced codes (sometimes termed EFCs). However, you can read about various 9XX commands at the JP1 Wiki.  Use the 994 keymove command "Assign Advanced Code 994 - EFC (one device mode)".  Also be sure to read about Channel lock and VPT (993 and 973).  The manual supplied with the RCRP05B describes these incorrectly.