Every marketplace has its own category tree and eBay adds business policies on top. In Closo you pick once; the editor shows how it maps to each marketplace and asks only for what it cannot derive. Recorded on the real editor.
Open the Crosslister1. Pick the category once
Open a product. The editor has master fields on the left and per-marketplace fields on the right. Click the category and search. One pick. Under it, Closo shows the category it will use on each marketplace. Show maps opens the full mapping.
2. Fix a marketplace that differs
Where a marketplace needs something the master cannot derive, the right column asks for it, and only for it. The header counts what is ready. All means every connected marketplace can list this product.
3. What eBay asks for on top
eBay asks for item specifics per category. The editor lists them under eBay requires for this category, pre-filled from your master fields wherever it can. These are eBay's own values. A value outside its list is refused, so pick from the dropdown. Shipping, payment and return policies come from your eBay defaults. If you have several of a kind, the editor asks which one, once.