Custom fields in all modules

Custom fields in all modules

I have used CRM for a while in the UK and have created a very useful database, however I created some custom address fields in the Accounts module, namely Address 1, Address 2, Town and Post Code. The Americanisation of the standard address fields within Zoho CRM are not suitable for the UK, that is why these fields were created, and the original data was imported with the correct fields, as I want them.
I want to display these fields in the Contacts and invoice modules, in fact any module where the address of the original Account needs to be displayed. 
How the hell do you associate custom fields with different modules. This is driving me crazy