If you are not able to see the transport details window in BUSY,when you trying to save a sale voucher,you can follow given steps:
Step 1:Go to the Administration menu,
Step 2:Click Configuration,
Step 3:Click Voucher series Configuration,
Step 4:Click on Sales,Select series which you wants to enable,
Step 5:Click voucher configuration,
Step 6:Here you can find an option on top right Input Transport Details,specify Yes,then save this window,
Step 7:Now you need to go and add a trasnaction again,while saving you will see the window input transport details,here you can add your transport details and save.