This will require two different bill layouts. You will assign different bill layouts to your clients depending on what information you want on the bill.
Start by duplicating the current layout. From the tool bar, select Bills, then Bill and Statement Layouts. Select the bill layout you want to duplicate and open it in the Design view.
Next, click on Layout and select Duplicate. You now see the name of the layout changed to "Copy of .....". This is a copy of your original layout. You can rename it by simply typing over the "copy of" name.
Select Configure Layout Sections from the drop-down list
If you want to show the balance on this bill layout, simply, check the box. If you do not want to show a Previous Balance, leave the box unchecked.
Save the layout.
Your next step will be to assign the new layout to specific clients. You can do this easily by opening a client in Client Information. Go to the Layout tab and select the new bill layout.
If you want to assign the layout to several clients, an faster method is to select Bills from the toolbar and then select Bill and Statement Layouts. Just click on the Assign button and check all the clients that should have the new bill layout.