When you initiate the listing of your product for the 1st time you select the main category. Then on “More Details” tab of your product you get to select “Category (item-type) basically a sub category. Changing the main category will require the AMZ catalog team to do it, make sure to get a copy of your description, keywords etc because when they make the changes it wipes all that info. Changing the sub category can me done by you editing your item.
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