Ans : Well, technically yes. You can create keywords of your existing selenium web driver scripts and use it in OpKey. Although it might not be much beneficial to you. OpKey provides a unique and rich keyword set of more than 400 keywords available; you can use them to quickly author your test case in opkey itself. Details on how you can create custom keywords is available here - https://opkey.com/user-guide/pages.php?subid=170&accordid=6&val=TEAM