Pick+Pack+Ship Settings in B2B Portal
Currently, there is no way to automate any of the Fulfilment stages for orders raised via the B2B Portal. There should be an option to set this as the defaults selected in General Settings also do not apply to B2B Orders.
This should be in the same manner as the Fulfilment options found in the eCommerce Integrations.
It seems a little strange that you can manage this for your manual and ecommerce sales channels but not your B2B channel.