right click on the field, choose format object, then select the number tab.
then click on the customize button. then unchecked the thousands Separator : Symbol : ,
check box.
You are done.
if your field is string
Within Crystal, you can do it by creating a formula[Field Explorer-> Formula Field-> right click->new Formula-> give a name] that uses the ToNumber function. It might be a good idea to code for the possibility that the field might include non-numeric data - like so:
If NumericText ({field}) then ToNumber ({field}) else 0
now follow the above steps for the formula field.