Hello,
we have two product types: bulky items shipped with carrier A and normal items with two carriers available, B (cheap but slow) and C (fast but more expensive).
If a customer puts in the cart one bulky item and one normal item, Prestashop sums shipping cost as carrier A + carrier C. Customer sees the sum of A+C rates but is not given the choice between carriers B and C for the normal item.
Carrier B is set as default carrier in BO ("best price").
Is there a way to force Prestashop to show in checkout both available carriers for the normal item, or to default choose the cheaper carrier instead of the faster one for the normal item?
PS 1.7.8.8
Any help will be appreciated!