Ok, so I figured out part of the problem finally....so let me tell you just in case you are searching and looking for an answer youself.
For Any Ebay Motors listing you go to listing like you would usually and there is a drop down that you must choose Ebay Motors US, or if it is Apparel/Acces. for motors choose the one just below that. Then browse the categories from there to find exactly what you need.
However, it does seem as though you are unable to place in a second category outside Ebay Motors. For example, I want to put motorcycle chaps/vest in the Motorcycle--->Leathers & Vests....and then put in general womens clothing--->but it will not allow me to do this. Maybe this is something I can change once it lists to Ebay, maybe not...but if you're running into the same problems, you're not alone!