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Well I did thst but there i can only see components and elements but not how the variables are set and operate? Or do i miss something?

Duplicate it to your own files for full access.

I tried this and was in design mode and did only see the error message by Figma.

Pasting unpublished variables across files does not create new lkocal variables yet.

So I assumed no variables have been transferred. I tried again in Prototype mode and now have them. Thank you : )

One component has 2 variants: Box unchecked, box checked.INteraction; change from one variant to the other. Now, You build another component with list of unchecked instances, this is your default variant, and a list of checked instances, this is your second variant. On top, you put a checked or unchecked instance, with the interaction of change from one variant of the list to the other.