Hi Im using prestashop v 1.6.1.20 . I'm into a situation where , I would like to manage fixed charges for a particular category, for eg. "LAB TESTS" :
- Customer can order 1 "Lab Test" called TEST1 - Fixed Charges $5
- Customer can orders More "Lab Test" ( TEST1+ TEST2 + TEST(n) ) - Fixed Charges $5
I need fixed charges for n- number of TESTS from category called "LABTEST" in my INVOICE ( Added to total ) , How can i do that?