Is it possible to import level Symbology Override settings between drawings?

I have several dgn files to go into and change the Symbology Override settings for the levels.  Is there a way to save those settings in one dgn, and import them into another file to save time? 
Under the Levels menu in the Level Manager dialog box, I do see 'export' and 'import'... but they're grayed out, and I don't see how to use them.
I appreciate any help!