Add field in Selection screen VL71 T code

Good morning Experts,

scinario- My client requirement  in case of Rail dspatch , OBD print out should be trigger  in mass.

Ex: Rail having 52 wagon and OBD created numbers of 40 , then 40 output should be triggered with single click.

Requirment half met with Standard T code VL71

Issue - there have field processor mode , with this field client facing problem...if they put 40 OBD , 20 OBD output triggered with processor mode 1 and half of OBD with processor mode 2..in this way difficult to monitor which are actually done and which are not.

   Tried with googling but not really helpfull to add range in  processor mode  selection screen ..some suggestion with implicit enhancement but not found exact spot to do...

     Kind request to help...

Thanks in advance ....

Deep