Dear David,
Thank you for your question.
Store Manager for X-Cart allows you to import your product data directly to your on-line store. You just need to prepare your .csv file, import it in Store Manager and preview all the changes at your on-line store.
Please, check our free trial version:
http://www.xcart-manager.com/download
And here is documentation guide on how to perform import in Store Manger for X-Cart:
http://store-manager-for-x-cart-documentation.emagicone.com/products-management/import-products
Please, contact us once again, if any questions occur!