Crystal Reports - sub report need to show value multiple locations

Have a main report that is grouped by productID and sub report that looks up the "locationid".  

The product could be located in multiple locations for example:
location: l21
location m28

I have the data showing in the sub report and reporting back to main but only showing one of the locations.  Is there a formula or something in can do in the sub to show both?  for example:  

product: 1234    Location:  L21 & M28
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I assume you are displaying the location in the subreport detail section.

IN the subreport report header add a formula like
Shared StringVar strLocation;
strLocation := "";

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IN the details use
Shared StringVar strLocation;
If strLocation = "" then
     strLocation := {LocationField}
     strLocation := strLocation & "  &  " & {LocationField};

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in the main report you will display with
Shared StringVar strLocation;

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Crystal Reports

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