You can manage the product categories in your shop by accessing the Product catalog / Categories management menu.
In order to change the type of a category or subcategory, click on the Edit button located on the Options column, next to the category that you want to modify. The Category type field allows you to turn the category into a subcategory or vice versa.
If the category you want to modify includes subcategories, these must first be moved manually under other parent categories or you can choose to automatically move all subcategories under another category during the process.
Listed in: Categories settings