Read before doing it.
Go to the planning TAB in ZE(ZeroEditor). A hub is a post as in baseball.
Place a hub, and move your mouse to the desired size and click.
If you want to move the hub, click on edit/move hubs on the left.

Then we need connections. A connection is where the AI actually moves.
To place a connection, click on place connection on the left, then click on a hub and on another hub.
If you want just soldiers to follow a path, click on: flyer, huge, medium, and light, so only hover and soldier are yellow.
For some reason the jettrooper are the hover-class.
Congratulations, you have just made your first plan.
To move a connection, click edit/move connections on the left, click on a connection, move the mouse over one of the connected hubs and hold down the right mouse button. now you will see that the connection turned blue(?), and a black line is between the other hub and the mouse pointer.
Release the mouse pointer over another hub to connect it to that one instead. Note that a plan start must have the hub over a CP, aswell as the end, due to that AI always aim for CPs in conquest mode.
Replace the CP with the flag or whatever is in that mode.
To make the hubs ground to an object instead of the terrain, go into you world 1 folder, and right click on ***.ter and properties, then tick ReadOnly
then you may raise the terrain to the ground of the building. Place a hub there, and connect it. Then click save, you will get an error message, but that doesn't matter.
Remember to untick the ReadOnly after you saved, otherwise you won't be able to make any height on the terrain.

And remember to put it in the right layer,
so if you have other modes than conquest in your map, they won't go the long ways i.e. to the flag.