Hello albertalley -
Auctiva has no direct integration with ShipStation, so there is no way to export directly from an Auctiva account to ShipStation for any of your product information.
In regards to the SKU's for variation listings within Auctiva, you can manually input your own SKU's into the SKU field in the variation generator while creating a variation listing, so you should be able to use whatever format is appropriate for your needs when creating variation listings in Auctiva, however, we are unable to assist you with ensuring that ShipStation is getting a full SKU regarding your sales from directly within your Auctiva account.
You may wish to consider contacting ShipStation directly regarding this question.
- Craig