Classifieds: company listing with several branches

I'm trying to create a content type that enables an end user to add a company listing, and for the company listing to permit several branches to be entered. I've created a new content type, and have cck installed. It is easy enough to use cck to create a field called branch, and allow multiple entries, but is it possible for these entries to impact upon further information (i.e. if there are two branches, then an address needs to be added for each branch).

I don't mind using different modules either, but I also want to keep things user friendly.

Ideally, I'd like the end user to add a new company, and whilst capturing information, they have the option to add more than one branch (each with different information). Then, when viewing the record, the generic company information should be displayed together with the information for the head office (additional branches listed somewhere), and if the branch is clicked on, then the display would show the generic company information with the details specific to the branch.

I'm no longer new to drupal core, but I've only begun to explore the modules available, and I'm certain others must have an interest in doing something similar. Any pointers would be great.

Thanks in advance.