Hi MikeB,
This is already included within our stock EditCustomer screen. You can copy that screen if you want to make customizations to it or view the different fields/objects and actions associated with them: Customize > Screens > then find the CRM_EditCustomer screen, click copy, and go through the wizard. Below is the Document section on our stock EditCustomer screen.

- Ashur
Need more help? Ask us about Method consulting services
Ashur Shamon
Lead Solutions Specialist, Professional Services
Method Integration Inc.
www.method.me
Toll Free: 1.888.925.6238
Local and overseas: 416.847.0400
Fax: 416.640.6027
E-mail: a.shamon@method.me