If your item is already listed somewhere, you can easily copy its information to crosslist it to other marketplaces:
1. Tap the "+ New item" button
2. At the top of the page, you'll find a "Quick import" option
3. Pick the marketplace you want to import the item from
4. The tool will pull all your recently posted items for you to pick from and import
5. Pick the item you wish to import, and click "import"
6. Boom, all the item info including photos and other details will be imported into your universal form and ready to crosslist