> You could make a self-referencing table example
>
> ID Description Parent
> 1 Root <null>
> 2 Node1 1
> 3 Node2 1
> 4 SubNode 1.1 2
> 5 SubNode 1.2 2
> 6 SubNode 2.1 3
> 7 SubNode 1.1.1 4
>
> And so on...
>
> Look here
> http://www.dbmsmag.com/9603d06.html (Joe Celko Article)
> http://www.codeproject.com/cs/database/persisting_trees.asp

Thank you Alexandre, wonderful help. Have a nice day!