Hi ZionTech
The function you are referring to is "Mail Merge". You create an external "Data Source" which can be a comma or tab-separated database of names and addresses, an existing address book in a suitable format, etc. Your main page is just one page on which you create "Form Fields" that fetch the data from the correct fields of the Data Source wwhen required and create as many printed documents as there are recorde in the Data Soure.
The following page describes how to do this in OpenOffice Writer v 2.x
http://wiki.services.openoffice.org/wiki/Documentation/OOoAuthors_User_Manual/Writer_Guide/Using_Mail_Merge(use the small menu at the right for each step).
Here's another well written page:
http://openoffice.blogs.com/openoffice/2007/01/mail_merge_in_o.htmland some issues of it being clarified:
http://openoffice.blogs.com/openoffice/mail_merge/Bill