You can also make the fields interact at the quantity level in order to multiply the price by choosing in “link to quantity” a quantifiable field (product accessory, declination table, declination list). Thus the linked field will be multiplied by the quantity chosen in this quantifiable field.
For example, if you sell printed t-shirts, you can choose to link the field “type d’impression (select)” in the fields “quantity of t-shirts (declination list)” as on the following capture :
