Server: Enable support for multiple groups per note

the sollution now support only one category.
for example [CATEGORY1] note.htm, [CATEGORY2] note.htm.
it would be awesome to get a more granulary categorism.

suggestion:
1.) Main category create a subfolder.
2.) Subcategory with the behaviour of [CATEGORY1] note.htm example.

with this it's possible to sort a more fine granulary know how database.

is this possible?