[libreoffice-users] difficulty with base

Bonjour,
I've searched but...and the examples are often too complex for me to 
understand how to proceed. I've tried getting help on the french list 
but without success, so...
So, I've made a test base that can be found here : 
http://dl.free.fr/nBchL3sR7
It contain 3 tables : personnes, villes and codes (it means persons, 
towns and postal code).
I've made a form where I wish to be able to choose a postal code (easy 
!) and then to choose a town witch match with this code, attending a 
code can match with several towns and a town can match with several 
codes too.
Well, I suppose there something regarding ways joining tables but I 
don't know what to do.
If someone has a few time to help me...
cordialement,



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