I highly recommend doing it the way Inferno said, that gives you a lot more freedom in being able to copy, paste, quickly scroll, search, etc.
If you're already too invested in a timeline, though, you could move the code you want to copy to a script, then have the steps call that script instead. Or you could do something like have the timeline set "alarm[0]=1" then have an alarm in the host object that fires the code you want at a certain interval.