In a previous post I did an overview of some of the concepts of managing lines in a sales order. How you print and distribute communication or handle combinations or orders is many and varied based on business practices. You can use parameters like the summary update to control some of these practices. As well you can use the parameters to split that you will find on the accounts receivable parameters. One for example is the ability to split the order confirmation based on delivery addresses if you have different delivery addresses on each line. This is a quick walk through of how the split parameter works.
Cheers
Lachlan