Jean
There several ways of doing your labels:
1. Print directly from Address Book
2. Use the template merge facility, drag an Address Book VCard onto the page, but this only lets you have a sheet with all the same name on it. This is as automated as it gets. Yvan has created an AppleScript which will give you some ability to multiple merge on specific Avery labels.
3. Make a template with only one label per page, merge from Address Book or Numbers, make into .pdfs and drag those into a pre-prepared template or label size placeholders.
4. Copy and paste into placeholder templates.
To sum up the merge method works with quirks, but won't give you multiple addresses on a sheet. Other than that there is no automated label printing.
http://www.freeforum101.com/iworktipsntrick/viewtopic.php?t=75&mforum=iworktipsn trick
Peter