Product Subcategories in Zoho Desk

Product Subcategories in Zoho Desk

Hi,

I'm looking to setup subcategories in our Products in Zoho Desk, I'm imagining a directory tree structure.

Main Product 1
      issue 1
      issue 2
      issue 3
      etc
Main Product 2
      issue 1
      issue 2
      issue 3
      etc

So if Main Product 1 is selected, only issues within Main Product 1 can be selected in the Subcategory.

I've create a custom Picklist Field and added the field to the Layout. As of yet I haven't added in anything into the field, such as issue 1 etc.

Is there a way in Zoho Desk to set this up? Is it possible to create dependencies between Fields? If Main Product 1 is selected then only issues under that top level selection are available?

This was easily achieved in ServiceNow, how can I do this in Zoho Desk? Are Products the wrong means to achieve this? Self learning this as I go so any assistance would be appreciated.