Here are some tips and suggestions.
1. Look at your products in their categories and if ALL products from that category can be listed in one category on eBay, then you can map them all from the 'Category Mapping' page. From the dashboard, click 'Map Now' then toggle to the Category page by clicking 'Categories' from the top right. See FAQ on how to map by category.
2. If your products are not in categories similar to eBay, then you will need to map products individually from the Product Mapping page. From the dashboard, click 'Map Now'. This page has all of your products that need mapping. You can search and filter your products to make it easier to map multiple products at once.
3. If the suggested categories are not appropriate for your products then you can choose categories. We have made it easier to choose categories by providing you with the most recent categories you have mapped to.