you need the action "Type a Keystroke" after the actions you use to switch screen, then just click in the box and hold the combination you want. I don't know what you mean by 'selecta'? It is similar in practice to how you create a 'hotkey'. I don't use OF3 so can't help you more. @tjluoma is right and we probably need more info and the macro itself. This will tell you how to do that.