How to write Recursive With Query for my requirment

I have a query which gives me the part# with additional sales information.

Case 1  This part# is under another component. first level

Case 2: This part# is under another component's  component . 2nd level. Sometimes it may exist in nth level.

How to write the REcursive with clause.?

  Select     part#, I can get other component here. level1  but if  part# exists in nth component how to get it  

  from 

  table

Appreciate if you can guide with any suggestion or pseduo logic

Thanks