Hi Vaughn,

Yes, you can do this. There are a few important points to know about this.

First off, make sure that the data types are the same. If they are incompatible then you can't use them to link the two reports together.

Second, before going into the Subreport Links dialog box, you have to have the parameter fields already created in both the main report and subreport.

If you have both of those items taken care of, then open the Subreport Links dialog box and choose the two parameter fields to link to in the Available Fields list and the Fields to Link To list. THEN, most important, in the bottom left corner, for the linking field dropdown box, don't use the default that Crystal gives you. Instead, click the dropdown box and choose the subreport parameter field again.  Choosing this field again is the key point to make sure the user doesn't get prompted multiple times.

That should do it for you! And I already have all this documented in Chapter 9 of my Crystal Reports Encyclopedia book. You can learn more at Amazon.com: Crystal Reports Encyclopedia