How To Create Dm With Xml

[jesmond]

Need help badly, here's my problem.

my boss wants a basic web site with drop down menu's so people can
choose CAR MAKE CAR MODEL YEAR ENGINE SIZE PART REQUIRED.

we have all the data in our system and can export it out to csv or xml i think.
my question is can i somehow create drop down menu's that will pick up the data, from the csv or xml file and give me the above.

customers can then link to our system and check stock levels prices and order.

I am totally in the dark on this one, our current web site
http://www.carpartfactors.com
is just not doing it so we want to start to sell our car parts online.

many thanks for any help given

jesmond