I don’t know if I can quite follow you. You can set the Origin Point every object via the following menu

You can set the 3D Cursor using SHIFT + S (which you have already done). Above the viewport there is another option where you can set the pivot point (see img). The pivot point is a kind of “anchor point”, when you scale or rotate your object, the scaling/rotation is taken from this point. You can also open the “Pivot Point PieMenu” with the “ . “ button.
Maybe it will help you
