Auto-Number generated for parent/children rows

I am trying to build up a WBS and would like set a number generator to auto ID the various levels (control accounts and work packages).

I would like to have the parent row, or control account, have an ID of 1.1 and the work packages, or child rows indented from there, to have an ID of 1.1.1, 1.1.2, 1.1.3, etc.

Being a little newer to Smartsheets, I am struggling to set this up. So far each row, regardless of if its a parent or child, gets numbered sequentially.

Is there a way to achieve the numbering system I mentioned above?



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