you only has to change the location for the DBC, and put the name of the table.
Example:
**I'm using form properties to store the objects
WITH THIS
.crxApplication = CREATEOBJECT("CrystalRuntime.Application")
.crxReport =.crxApplication.OpenReport("c:\REPORTNAME.RPT")

**You have to make this part with every table in the report.
.Crxreport.DATABASE.TABLES(1).SETLOGONINFO("c:\DATA\SYSTEM.DBC,"","","")
.Crxreport.DATABASE.TABLES(1).LOCATION="Invoices"
ENDWITH

You can do it like this, or you can dowloand from here my class for Crystal Reports, that will do it for you.
Luis