You can use Replace Field Contents (by calculation) or a looping Set Field. Back up before trying a new process. Either way, the calculation would be the same:
variable * 3
If you use Replace Field Contents be sure to perform the action when no Users are in the system (to protect from record lock). Here is an example of a looping script:
Show All Records
Go To Record/Request/Page [ first ]
Set Field [ yourNewField ; variable * 3 ]
Go To Record/Request/Page [ next ; exit after last ]
Thank you so much... This is exactly what I was looking for!