where can I populate some fields in Shipments Workbench in LCM?

Hi Community,
I'm setup LCM, in the Shipments Workbench after pressing Create Button, the system shows the Create Shipment form, there I populate the fields: Operating Unit = Dish Mexico, Shipment Type = IMP EQUIPOS, Group Reference = EQUIPOS, Source Type by default is Purchase Order, here in Third Party field there aren't values to choose, of course in Third Party Site neither, where can I populate the information for these fields?

I attach you a file with screnshots.

Thanks and Best Regards,
Gualberto