Oh now I get it. You just need to select the SKU with the variations you need to keep and the SKU info are not getting lost they just add up (if you have 2 QOH in the first SKU and 3 QOH on the second SKU the merged SKU will have QOH = 5, same with lookup if both have 1 lookup number the merged SKU has 2). This way is even better, I thought that the info of the first product are getting deleted.
Could you also add somewhere in the window (e.g. window title) that we select the product the variation SKU we need to merge which is the variation we are linking?