I have catalog for which I have created a variation property called "Size". Is it possible to map data to this property when importing a csv file using the catalog import functionality?
Yes it is possible, just create Size variation property before importing and then ensure that your csv file has a column with Size. But to correct import variations your data should have some relation property which should mapped to MainProductId in date mapping blade.
Id Name Size MainProductId
1 prodBlue Blue
2 prodGreen Green 1
3 prodRed Red 1
Great, it's working now. I already had the MainProductId figured out, but I wasn't aware of the automatic mapping of properties.