Ecomdash manages variations at the Child SKU level. Each variation would have it's own SKU number and would be linked together under a Parent SKU. The Parent SKU would then be listed to a sales channel that supports variation listings. Child SKUs can also be listed individually, in addition to the combined Parent listing.
For more information about creating and listing Variation products, see this guide: http://support.ecomdash.com/hc/en-us/sections/115001115766-Variation-Listing-Management