They are trying to make it so automated. Tries to push you in a certain direction. I could not select a 30 day By It Now. Limited categories. I was trying to list concert band sheet music and the categories were not there. Every time eBay does something, it gets worse. The new format should come with electronic crayons.
What I would do is search ebay as if I was looking to buy concert band sheet music. When it takes you to the category select a similar item you have for sale and in the listing it will have a place you can select to sell one like the listing you are viewing and it will take you to the correct category. Give this a try, makes it very simple.