This process is controlled by the Invoice Style. 

In Billing Manager, click on Tools, Invoice Style.  Choose the style on which you want to turn off concatenation by double-clicking on it.  At the top of the screen, click on “Invoicing” and “Settings.”  Remove the “√” from “Concatenate Fees.”  Click “OK,” File, Close, and then “Yes” to save the template.

Note:  This can be turned back on by following the above-steps and placing the “√” back in “Concatenate Fees”.  Instead of “File” and “Close,” you can do a “File” and then “Save As” to create a new invoice style that does not concatenate.