Show rows of a standard LN Cloud Session

Hello,
I have the standard session tsmdm2100m000 for a customization. In it I need to display only the records (rows) that belong to a specific department. I have made a session extension but I have no idea how to do it. :confused:
I have 2 implementation options:
1) Do it by code

get.var(parent, "codEmpSer", codEmpSer)

if(len(codDepSer) >1) then

message(concat$(" ", "Departament: ",codDepSer))

endif

tsmdm200.cwoc

the variable codDepSer I was thinking of comparing it in a select with tsmdm200.cwoc to make a stor by
or
2) Create an additional field and filter by it.

Thank you in advance