I know how to do that kind of thing.  I used a macro to create, and
position I_beams using an array of endpoints.  With a box you also have
to specify something like a down direction.  In my macro I used the
origin for this direction.  I think I may need to know a little more
about what you are trying to do with it, if I'm going to help you.  I
will probably have to adapt it a little.  I can send you a picture
demonstrating what I'm talking about.  

-- 
Dan Johnson 

http://www.geocities.com/zapob

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