Is that hard to understand for someone else? Don't really know how to explain it better, because of my bad english. I tried to explain it in two posts and one picture...
And no - it's the same than in xordis example. "Box 2" is just a name for a Set List, for example "Set List 1", do you know?
I bought the Lego Set-Box X, Lego Set-Box Y and Lego Set-Box Z (X,Y and Z are Setnumbers). I store it in the original Lego Set-Boxes in my room. I tell Rebrickable, I have this Sets like that:
My Set Lists/Set List 1:
Lego Set X
Lego Set Y (contains Part 3960 in Lime)
Lego Set Z (contains Part 3960 in Black)
Now Rebrickable knows, which parts I have and in which sets they are, because I told Rebrickable the Setnumbers - not the loose parts of the sets.
Want to build something, so I "ask" Rebrickable: "Where is my Part 3960 in Lime?".
Rebrickable knows - it is in the Lego Set-Box Y - but it tells me in the Part Summary and in the full Part Detail page: "You have some in Lime and Black and they are in Set List 1".
Why do I need to know, that they are in Set List 1? I only want to know to which Lego Set-Box I have to go to take it out of the Box.
Why doesn't it tell me "You have some in Lime and they are in Lego Set-Box Y, and if you need more in other colors (Black), you can also go to Lego Set-Box Y?
Thats doesn't matter, if this is in "Build a MOC", in the Part Summary, or in the full Part Detail page.
How do you all find your parts digitally? I can't believe, that I'm the only one with that problem.