Dear northernvalleyla,

   In addition to AlcaeusF words, I can say that if you have a need to add addresses onto the multiple invoices you can use third-party apps for this that will be helpful in importing any amounts of data into your QuickBooks company including updating your existing transactions such as invoices by putting additional data to it.  You can get more information on such apps at the Intuit App Store.  The apps will analyze all the data and help you with importing, also they usually have a friendly support team that will be eager to help you with all the questions you might have. But the most important here is that you would basically often need just an excel/CSV file with the data, tell the app where you want that data to go(mapping process) and then it will be completed in a matter of seconds. So, considering such apps could be a good addition to your business. I would suggest going with Business Importer app if you would like to know my opinion as I worked with them and know their capabilities.

Have a wonderful day!