TreeView How to do this?

Question

I have create table in database name"Group" contains ID,Rank,Name like this:

ID   RANK    NAME

1     A      Main

2     A1     Departments

3     A2     Companies

4     A3     Usres

5     I      Invoice

6     T      Tools

7     T1     ChangPswd

8     T2     ChangLanguage

how can i make 'A+T'is parent and (A1,A2,A3) is childnode?