If I drew a 2nd drawing controlled elk tag and already purchased a regular season elk tag

The answer depends on the elk tag you currently posses. Any exchanges must be completed prior to any open seasons for the elk tag you currently possess. If the elk tag you currently possess does not have an open season until after the drawing, you can exchange your general seasons tag to the controlled hunt tag. You will need to take your tag to the nearest regional office or the headquarters office to complete the exchange.