SAP GUI Scripting WBS

Dear all

I have routine in VBA to create WBS element and it is working fine. But some times I need to ad more wbs elements in the project.
Does someone have an idea how to do so by using scripting? Look at the picture. How to find out the logic in the wbs structure? If would like to ad the next element under node G-00005-50-01, what the logic I should use to do so by using scripting?
Thanks in advance