Hi again Joaquin,
I have just replied you via Support Ticket system. I am so sorry for delaying in reply to you. That because I had a summer holiday and I was too busy after coming back. The feature that you want is not supported by our Shipping Pro extension. In the ticket, I was asking you to confirm so I can find a solution for what you want.
Please following the ticket to get the supports.
Sincerely, Giang