Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

Using a PROCEDURE statement with PROCESS:

%PROCESS   ;
%PROCESS   ;
%PROCESS   ;

 /*  optional comments */

 procedure_Name: proc( ... ) options( ... );
   ...
 end procedure_Name;
Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide