Prestashop multistore issue. Qty is not updated on sub store

I installed prestashop multi sotre function. everything is working fine but sharing cart is not working. When I enable sharing cart, qty can not be updated on each shops. I want to share cart for shop group. (make one order for multiple shop) Please solve these issues 1. Share cart for same shop group ( different shops but same one cart for one order ) 2. Cart shipping charge for sum of total weight of all items ( not for each vendor ) 3. Share Qty for main shop (=default shop ) * EXAMPLE [login to view URL] (default shop) [login to view URL] (shop1) [login to view URL] (shop2) itemA in shop1 itemB in shop2 itemC in shop2 * CONDITION 1. itemA, itemB is displayed in default shop 2. user purchase itemA on shop1 3. user purchase itemB on shop2 4. user purchase itemC on default shop * RESULT 1. 3 items are in one cart. 2. shipping charge by total weight of 3 items (not by each shop) 3. each shop can generate their own invoice. (they can not see others order) I attached my configurations. *** IF YOU HAVE ANSWER, ASK ME. I'LL GIVE YOU LOGIN ID OF MY TEST SITE *** *** AFTER ANSWER MY ISSUES, I'LL AWARD YOU **** *** SO IF YOU HAVE ANSWER FOR THIS, PLEASE BID ON THIS *** Thank you.