Is there is a way to create a custom button to place next to a field to copy data from one field to another?  For example, we have a case description field.  On the same page we now have a Billing Description field.  Sometimes these need to be different, other times they are the same.  So I was wondering if it is possible to have a button next to the Billing Description that would copy the case description field to the Billing Description field?

Is there is a way to create a custom button to place next to a field to copy data from one field to another?  For example, we have a case description field.  On the same page we now have a Billing Description field.  Sometimes these need to be different, other times they are the same.  So I was wondering if it is possible to have a button next to the Billing Description that would copy the case description field to the Billing Description field?