Modifying existing xlate to route messages appropriately

I’ve an existing thread with an ORM translation that currently xlates and routes messages to SYSTEM A.  The order control segment (0(0).MSH.00010)of the inbound messages now contains an element which determines whether the messages should be either xlated and routed to SYSTEM A or just routed to new SYSTEM B, hence the need for the routing modifcation.

If the segment contents begin with the literal strings ORDERE- or CANE-,  the message should be routed only to SYSTEM B, but should not be xlated and routed to SYSTEM A.  If the message segment begins with any other string (ORDERU-, CANU-, QSTAT-) , it should be xlated and routed only to SYSTEM A.

I’m stumped how to best handle this modification as I relatively inexperienced in writing/using TCL code and TCL code fragments.  I think the best solution is to read the first  6 or 7 characters of the segment and  make routing decisions based upon the comparison to the above literals.  May I ask for a few hints/suggestions?

Regards,

Bob Hamilon