From ZDoom Wiki
88:Polyobj_MoveTo (po, speed, pos_x, pos_y)
Moves a polyobject in a straight line towards an absolute destination.
- po: polyobj to move
- speed: how quickly the polyobject should move, in map units per octic.
- pos_x: the absolute X coordinate to which the polyobject must move.
- pos_y: the absolute Y coordinate to which the polyobject must move.