autocad 2000 how do i draw a vertical line (on the z axis) whilst in isometric view.?

Answer 1

Depends on your isometric view. If the Z axis is "up", and X and Y are horizontal (showing at 45º left and right, and if you know the coordinates:
- line x,y,z (first point)
- (next point) @x, y, z
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You can also use snap to nodes if you want to join two nodes (the ends of the line you want to draw).
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You can also set ucs to front view (xz plane), then view isometric. The line you trace will be in the xz plane... etc
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On difficult drawings, I use a layer for nodes only (points) set to PMODE 66 and PSIZE 1, on a bright colour. I set my points in space (point x, y, z), then link with snap in 3D view.

Answer 2

pen or pencil and a straight edge helps