Hi there is a possibility to elimante from GSX this function and maintain only pushback service and boarding deboarding aircraft?
Well, you surely can just remove the cargo doors by setting "No Door at this position" for both cargo doors, in the airplane configuration page.
However, why you want to do that?
To save time? Unless you have very few passengers, baggage loading takes about the same time.
To save fps? Baggage loading is less performance intensive than passengers, if you have fps issues during boarding, you should disable passengers first.