Sub Category in New Request Drop Down

Sub Category in New Request Drop Down

Hi,
 
Is it possible to create a sub category of a New Request in the drop down menu/box?
 
For Example in Request Drop down:
 
...
Marketing
Operations
      -  Account Locked (Sub Cat of Operations)
      -  Password Reset (Sub Cat of Operations)
      -  User Query (Sub Cat of Operations)
Projects
App Support
 
Kind Regards,

Andy
 

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