i would like to add some obvious changes that has to be made in the application program.
Need to ALTER the existing TABLE to add the new colomn
ALTER TABLE <table_name> ADD COLOMN <colomn name>
and need to once again generate the DCL GEN host variables.This is the change for the program.As for JCL, no change i think is required.Once you compile the program and resubmit the JCL it shud work fine.
Regarding the JCL changes do not consider the answer i gave as the final one.
if ur going to add new colum and ur using that colum in ur progarm, then u must create a new copy of dclgen member then you are using that member in ur program, in jcl you must precompile compile, link, bind a new plan and then run the program