Warehousing items for all integrations can be synced manually. For Shopify, WooCommerce, Ecwid, Storenvy, Weebly, and BigCommerce stores, warehousing products are also available in the product push generator, which works similarly to the Printful product push. Simply go to your store → Add product → Inventory, and choose the product from your inventory. You’ll be able to edit the product title and description, as well as set retail prices.
You can also watch this video to see how it's done: