Is there a luggage transport company that will transport luggage going south

Hi Daisy. Welcome on the forum.
Your post is in the wrong subform. ThePortuguese Interior route is not the one you are going to do I think. It is far from the coast at the east side of Portugal
Go to the subforum Coastal from Porto and coincidentaly somebody else asked the same question so there you definitively will find your answer. It is a regular question on the subforum Coastal and Central route.
I don't think they supply swrvices like that on the interior route .
Bom caminho