I just now realized that there were replies to my question I posted months ago. For some reason the new posts were not coming to my email.
I did find an answer that worked. I will paste the information below in case anyone else looks for this information.
If you have multiple eBookmans it is possible to use one computer for all. Simply create a new directory in "Program Files\Franklin Electronic Publishers\eBookMan Desktop Manager". Name it so it is easily recognizable which unit is to use this folder. Then, in the Desktop, under the File menu select Change Sync Folder. It will automatically create the Audible, Contents, and Library directories under the new directory.
Remember to change the directory before syncing the unit to the correct one. This is required because the OS is keyed to the serial number of the unit."