When making changes, Billing Assistant is designed for generating one bill at a time. I suspect that the issue is, when you switch it to multiples it loses the changes to the single matter by design. If you make changes and generate a bill for just that single client, does it work as expected? 

When making changes, Billing Assistant is designed for generating one bill at a time. I suspect that the issue is, when you switch it to multiples it loses the changes to the single matter by design. If you make changes and generate a bill for just that single client, does it work as expected? 

I normally don't have to edit a batch of bills done here.  In this instance, the client has about 20 matters that generate on a consolidated bill.  So, I go through and make he edits to hold charges on about half of the bills.  Billing Assistant shows me the "overview" screens that are exactly what I want.  However, when I actually then generate the bills to display or print, TS goes nuts and invoices all of the "unselected" charges.

This is a horribly design flaw since Billing Assistant clearly let's you do these kinds of edits, it preserve the edits as you move between the matters and then - WITHOUT WARNING - it does something quite different than what is reflected.