Is is possible to add folds under the Custom Reports menus?

We have 10 active Company Codes. Each one has a set of core sales reports that are exactly the same except they pull the sales reps, customers & products from the specific company code. Due do performance issues I can't use dynamic parameters in the CR. This make the Custom Reports menu under Sales Order extremely long so I was wondering how I could create sub-folders under the Custom Reports menu for each Company Code. Any Ideas? It would look something like this:

Sales Order

...

Custom Reports

->ABC

Report 1

Report 2

->DEF

Report 1

Report 2