Crystal Reports XI - update multiple copies (instances) of scheduled reports in crystal reports server (all based on the same report).

We have a crystal server with scheduled reports going out via email.  Many of the reports are the same but with different parameters.  For example, the customer# may vary, or the email destination, or the email format type may vary.  However, the report itself is the same.  For example, a daily delivery report for specific customer.  

Is there a way to update the report once when you want to change something - for example, add a field.  Right now, we have to go into crystal reports designer, login to the enterprise crystal server, and open each instance (by specific customer) and edit that report (the same change for every instance).