This is documented in Installation section of the CA Database Management Solutions for DB2 Guide in section Start your Product at the following link:
Enter Directly into a Product Menu
To access a single product directly from the main menu product panel, use the PARMS parameter when invoking or executing the product:
RSPMAIN PARMLIB(parmlib) SUFFIX(nn) PARMS(CI=pgmname)
Where pgmname is the name of the program for the product you have installed (as described in the table in the mentioned link).
Note: If the product you have installed is not listed, it might have an alternate method of execution without the CA driver; see your product user guide for information.
RC/Query Program Name (pgmname) --> RQLMAIN
Once you have entered the parameters and program name, executing RSPMAIN takes the user directly into the main menu for the product.
Additonal see at the mentioned link for the complete list of Program Names for each product.