Creating a work flow to copy data from one field to another

On a company record I want to be able to copy the data from the mailing address fields (address 1) to the physical address fields (address 2) by adding a 'Copy to Physical Address' check box to the form that users can use. This would make inputting information a bit faster if the form could populate the physical address fields with the click of a button.

Can this process be achieved by creating a workflow?