VBscript to create advertisment subfolders?

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Hi!

I have a VB-script that is creating advertisments for me. Very handy.
:-)
But I have organized my advertisments in subfolders. And the vbscript
always put new adv in the root-folder.
I have searched the whole Internet & MSDN but cant find any details on
how to create advertisments in subfolders. Either with vbscript,
powershell, sql.. anything.
Does anyone know how to do? There must be a way.. either with WMI or
direct SQL-code.

All I found is a attribut named hiearchy_path. But it is documented as
reserved and I cant get it to work.

Kind regards, Magnus Finbom
.