How to assign more than 3 parent categories to a category
By default we only allow you to assign up to 3 parent categories to an individual category (to keep things simple).
But this is a setting that you can change in your account yourself. You can do so by following the instructions below.
1. Select 'settings' from the left menu and then 'products'.
2. Change the number in the last box titled 'maximum number of parent categories a category can have'.
3. Click the 'save changes' button at the bottom of the page.
You'll now be able to assign more parent categories to a category.