are you wanting to plot multiple Files? or multiple Layouts? if you have for instance 10 Layout tabs, just go to File -> Publish to plot them all at once. or, for example, if you have 10 seperate *.DWG files, then type SSM at the command line to bring up the Sheet Set Manager, from there you can bring all the files into here, then set them up to plot all at once. Hope this helps.