This is a simple profile to add VDGS to all commercial parkings (1 to 28) that have it on the real airport. 

For more convenience, I corrected placement for aircrafts on each gate, based on Fenix A320 for all gates, except for gates 6, 8, 9, 17, 18, 19 and 20 based for Headwind A339X. I have not been able to place the aircraft on stop line at gates 3, 4 and 5 because jetway will connect to rear door, even if I disable it in aircraft profile (maybe you can try to change it with PMDG 737s because I do not have this aircraft).

All other services work correctly as based features are already included in GSX (ground services, right left pushback, refueling and boarding/deboarding).

Because of a SODE issue with jetways, passengers legs can be seen below the jetway, if anyone know how to change it, please advice and I will change config file.

To install just drag and drop the .ini file in your AppData\Roaming\virtuali\GSX\MSFS folder and make sure you have only one profile for OPIS airport.

Enjoy !