This command draws full and partial open web joists/trusses in elevation.
This command will draw a truss of any length (provided it is at least a little
over twice its depth). The partial joists/trusses are drawn as individual
objects so they may be easily modified and/or trimmed etc. and the full
joists/trusses are made into a block so that it is easy to move without having
hundreds of tiny loose objects to worry about.
Command: 
Select objects: OPENWEB
Enter the distance you would like for the depth of the truss and enter the
depth for the top and bottom chords. Then select the image of the type of
truss you would like to draw (partial or full).
[Partial truss]
Select start point for truss @ back point of bearing:
Select the start point for the truss. The endpoint, midpoint, and
intersection snaps are added to your running object snaps if not already being
used.
Select end point of truss:
Select the endpoint for the truss to show how far to draw the truss. The
perpendicular snap is added to your running object snaps if not already being
used.
--The partial truss and "cut" line are
drawn--
[end - Partial truss]
[Full truss]
Select start point for truss @ back point of bearing:
Select the start point for the truss. The endpoint, midpoint, and
intersection snaps are added to your running object snaps if not already being
used.
Select end point of truss:
Select the endpoint for the truss to show the full length of the truss. The
perpendicular snap is added in addition to the endpoint, midpoint, and
intersection snaps if not already being used.
--The full truss is drawn--
[end - Full truss]
