I saw your original post
communities.bentley.com/.../95112.aspx
everything Alessandra suggested is correct.
when you create a new file in powercivil or microstation, it just copies the default seed.dgn
Depending on what State you are from, I strongly suggest that you get a seed file from your State because the file would be already set up with the correct working units. Everytime you need a new dgn, copy the same seed file so that all your references match up.