Related List Hierarchy not visible

[vivekghildi]

I'm trying to display a hierarchy like structure in the case form so that the end user can drill down and navigate to the product and finally choose the product for which the case is being created. 

This is the hierarchy of product models that I have created - 

To my surprise, blank window is being displayed. Can we display hierarchy in some other way?

Is it at all achievable through the OOTB 'Field Name'?

[RaghavSh]

@vivekghildi If I understood correctly, shouldn't the type of field you selected should be "Reference" instead of "FieldName".

Please mark the answer correct/helpful accordingly.

[vivekghildi]

I don't think 'reference' type will work as I want a hierarchy to be visible for the product that is initially selected. Not all the records. If I set the field type as 'reference' then the following will pop up.