Desparate for help.

I'm using Northwind as a template for a Purchase Order database. In the
Orders Form / Subform I want to have a Suppliers combo box which filters the
Categories combo box (to limit the list of items for the next combo box)
which then limits the Products combo box. I have seen examples, but seen t
being going round and round and gewtting no where (pssibly due to my lack of
expertise in Access).

I am needing t finish this project urgently and ask for any help that could
see me thru to the bitter end.

Thanks in anticipation