I am currently working with my master units set to meters and sub units set to millimeters. However when working with my floor manager, I am getting the following message at the bottom of my screen:
"Working Units Differ: FloorMaster Dgn mm:mm And Current Dgn m:mm".
Therefore, how do I change the unit settings within the Floor Master Dgn file to also read m:mm? Is it simply a case of finding the file and changing the settings within it, or is this not the right correct way to do it?
In order to change the project's Floor Master working units to m:mm you'll need to directly open that project's BB_FloorMaster.dgnlib file and make the changes there. I would suggest checking its location via the BB_FLOORMASTER_DGN configuration variable while in the project, just to be sure.
Before closing be sure to Save Settings so that the working units change is retained. Also Compress with the Delete Building Dataset Elements option enabled to clear out the DV related levels, patterns, etc., that are added when a file is opened. Or, you could change the working units using plain MicroStation to avoid that scenario (but still Save Settings).