How would I go about adding a new field to all Backend Magento Customer Address forms?
I've looked into Magento's EAV system but none of the tutorials about adding custom address fields seem to work or make any sense.
I've gotten to the point where i have the
mysql4-install-0.1.0.php file in my module, but I'm not sure what needs to be in there to add the new EAV field to the customer addresses.
Any help would be massively appreciated, I'm pretty new to Magento but I've worked with PHP for years.