been reading ms access 2003 inside out, and from it, i've learned how to use
a combo box to filter another combo box

my question is, what if i want to use this filtered combo box to filter a
list box? - and if that is impossible, is there another way to set this
problem up so that the user can choose from list A and have that choice limit
the options on list B, the choice from which in turn limits the user options
in list C?

for context, the options in list A (cases) are in a one-to-many relationship
with the options in list C (depositions), and the options in list B
(attorneys) are in many-to-many relationships with A and C - for the purposes
of the form, the user will only ever need to choose one option from list A
and one option from list B per use of the form, but may need to choose more
than one option at a time from list C

thanks in advance for any insight - i've been banging my head on this
problem for a solid week and could use any information at all