Edit data from column A but update to column B

Hi, i create a system where employee update data, but only after approved by manager it become updated.
Some of  the column are this : 

The Address, New Address    

When a employee update, his data will input to "new address".  So i want, when the manager clik edit button, the content of "new Adress" will go to address (updating column "the address"). How to do this?