When the drawing has been created open it and select one of the dimensions you want to edit, on the utilities tab there is an option for line type change it to center line then right click on the properties of the dimension you want to change to center line and also change the line type scale. I have also created a short utube video for you on this please see the link below.
http://youtu.be/-sBlNFw-DGc
copy the link and paste it to your browser it will take you right to the video, the video is without sound.
Regards,
Julio Alfaro
