Hi
This area of the package is unfortunately not that well documented. However you can use the NodeLink2 component to create off mesh links between different points on graphs. Unfortunately right now only the RichAI script has built-in support for automatically detecting these off mesh links, however that cannot be used for grid graphs. The AIPath script will just try to follow them as if they were part of the path, which may lead to strange behavior. So maybe you will have to make some modification to the movement script that you are using so that it can detect these links and teleport between them instead.