Support one-to-many autofill relationships

[WattyRev]

Between variations, one panel may turn in to two or more panels. Right now, there's no way to set up autofill from so that the one panel on one variation autofills into all the related panels on a second variation.

Will also need to think about the reverse scenario. When autofilling from multiple panels to one panel, which panel's color is used? Maybe just whatever one is first?

How does this work with progressive variations? Maybe there's one panel in Variation 1, and 2 panels in the same spot on Variations 2 and 3.