Why do you need another Air Lock? There's already Cloud Nine?
But yeah to have a new ability just copy the original name and description table,
expand them, then repoint.
Same as expanding any table.
But to make it actually have an effect you have to expand the Damage Calcs etc.
Cloud Nine and Air Lock are actually handled in many different places, so its actually one of the harder ones to copy. Because you have to find every mention of it, then branch, check for a third one etc.