WBS elements hierarchy

Hi,

I need to know the WBS elements hierachy in table PRHI.

Say for eg. in PRHI my WBS elements is E.00011. (just imagine it is tree structure ). I have 4 fields of UP,DOWN,RIGHT and LEFT. So for a perticular node,I need to process all the left ,right and down node and for each node i need to do some calculation.

So from parent I need to process from left to right ,up to down.

Kindly clariify,

Points will be awarded

Thanks in advance.