Adding variation types and sub variation types
You can create fruits as taxonomy and assign this to your product type.

Creating Taxonomy:


Go to Administration -> Structure -> Taxonomy.
Click on "Add vocabulary" link to create new taxonomy and it will redirect you to taxonomy form.
Add name(fruits) for vocabulary and save the form and it will redirect you to list of taxonomy.
Click on list terms in row of fruits taxonomy.
Click on 'Add Term' link to add new term for fruits taxonomy.


Assign Taxonomy to product type:


Go to Administration -> Store -> Product
Click on Product types link in top of page and it will redirect you to list of Product types.
Click on Manage fields link in row of Product.
Add Term Reference field and select fruits as vocabulary and save the form.


Selecting taxonomy as menu:

If you want to display taxonomy as menu, you can use 'Taxonomy menu' module.     


  Transform any of your taxonomy vocabularies into existing menus
  easily!


Taxonomy menu will create your Taxonomy Term as menu item.

Configuration of Menu: 


Edit your taxonomy in admin and select Menu location for taxonomy menu.