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What you want is to establish a User Coordinate System whose XY plane "lies on" the surface of the extruded beam you want to draw on. UCS command, [there are different ways to do it but probably the easiest:] ZAxis option, pick an origin point anywhere on that surface [Osnap to a corner or edge of it], and give it a positive-Z axis direction out toward where you want to be "looking" at that surface from. PLAN command with current-UCS option, draw the outline on that surface, and EXTRUDE it or PRESSPULL it [the current UCS's Z axis direction is the way it will "aim" with a positive extrusion distance]. You can then take the UCS back to Previous or World, or do another ZAxis option to draw some other beam off a surface of what you just built, etc.