Inventory system save, how?

Hi guys! I need some help.
It is the case that I built a Inventory in the UE4’s basic tutorial help docs. No just I started to save-all, I stuck here! I save-all I can sing, but can not get it in particular, which was to be variable! How the hell did I come ?! Someone who might have done it once, he knows which are the ones that are held there on the items recorded in the Inventory ?!
Thanks a lot in advance !!!