
If none of the variations parameters are available then you can have up to 2 Customs Variations names for each Taxonomy(Etsy Category).
How to map a custom variation for Etsy.
Example :
1. Variation name = Rail Length
2. Map the variation the following way : Rail Length-Custom1
Rail Length is the Variation Name in Ad-Lister and since there is no value for it on Etsy, you will have to use Custom1 in this case