Please don't ask "best" questions. That implies your reader has a relatively good idea of how you quantify "best". Given your description, I'll choose "easiest".
In SSMS, navigate to your existing procedures in the object explorer. Right-click on the procedure, select <Script stored procedure as>, <create to>, <new query editor window>. In that new query window, change the name of the procedure
as you see fit and then execute the query by clicking on the Execute button toolbar.