Hi, I am selling a necklace with free gift box on my store. However my Aliexpress supplier sells them separately. I would like to automaticly order both of them even if my costumer buys only a necklace. I am using Dsers to place orders. I know I could add a "Gift Box" item to my products which costs 0 dollars, but I dont like this idea. I would like to do this automaticly. Thank you for your help!