With this function you can create a path in GameMaker:
Studio without using the path editor. this function will return
the index of the path which should be stored in a variable and used
as the reference for that path from then on. Please note that the
created path is empty ie: it has no points defined, so you
will then have to use the other available functions to add points
to the path or be using
mp_grids to generate the path. Once you have finished
using the path, or wish to create a new one and store its index in
the same variable you should first delete the old path with
path_delete to prevent
memory leaks which can eventually crash your game.
global.newpath = path_add();
This will create a new path and assign its index to global.newpath.