Set Pathfinding to use pre defined points

I want a sprite to find the shortest path using a set of predefined points. Is there a way for Pathfinding to do that?

Bascally I have a grid of squates with 4 Imagepoints on the each. I would like the Pathfinder to stick to those Imagepoints only.

EDIT: All my squares are isometric.

And I want the sprite to stick to those image points, and go in straiht likes from each one.

Sorry about leaving that out.

If all the squares are the same size, you can go into the pathfinding behavior and set it to grid based and change the cell size to the grid size.

Oh, I left out a point: All my squares are isometric.

And I want the sprite to stick to those image points, and go in straiht likes from each one.

Sorry about that.

BUMP. Any help?