Do you know the subdealer-modul for fsales or SMIT?
With the subdealer-modul you can give your subdealers dircet access to your vehiclestock. So you don't need to send them lists or files to inform them about your vehicles on stock. If your subdealers are also using fsales or fsales light they can directly search for your vehicles in their fsales and can create offers or orders for those vehicles. You can also set the authorization which dealer can find which vehicles.