OP definitely needs to elaborate for a better answer, but I've seen this kind of CSV-ish structure used once or twice to define something like a tree structure (not that it's a great idea, more there was a CSV hammer and hence . . .).

Edit: Just to be slightly more concrete, they had something like this YAML 

---
Top A:
  - A1
  - A2:
     - A2.1
     - A2.2
Top B:
  - B1:
     - B1.1
     - B1.2

[download]

And they represented as something like: 

Top A,
Top A,A1,
Top A,A2,
Top A,A2,A2.1
Top A,A2,A2.2
Top B,
Top B,B1
Top B,B1,B1.1
Top B,B1,B1.2

[download]

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^2: Creating a Multi Level Hash from CSV by Fletch
in thread Creating a Multi Level Hash from CSV by workInProgress12

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