According to Airac 2305; for P2ATC -> Taxi Mnt -> search for airport ICAO code -> Save/Load tab -> Load Airport Taxiways (choose the xxxx_Taxiways.gxl file from the download [replace xxxx with the ICAO code of the airport]) & Load Airport Gates (choose the xxxx_Gates.gxl file from the download)

Unfortunately runway assignment for takeoff/landing only and/or preferential runways cannot be exported, so you have to set it yourself, so e.g. P2ATC doesn't give you an arrival to a runway that is only used for departures in real life. You can google this for most airports really quickly or just look at the Navigraph charts (general airport infos).