Hello Ruben,
i dont think there is a specific transaction. for ex to have the target procedure as OPR, you need to set up the master data of the exported materials as OPR: flagged,assigned to OPR CUstoms id, license created, BP assigned to both product master and license, Customs id set up in ECC/GTS, materials retransferred; then, when you export, the system will automatically set the target procedure to OPR..
same for CWH and IPR
hope it helps
Assen