Well I solved this with a not so elegant roundabout way
.
1. Dumped directories to text file.
2. Replaced the O:\ with ' and removed all spaces.
3. Replaced \ with a tab using ^t.
4. Imported text file as tab delimited into excel.
5. Deleted column d and any column after that.
Joila..... a list only 3 dirs deep!
Good night,
Ron