Does that mean I can't just use the 'Import' command to do this on my C3000??
Yes, it means that you just need to use the "Synchronize->Sharp_DTM" menu and it will automagically import all the contact entries that are already in your Sharp builtin address book program. The same menu will then keep both the builtin address book and Ka/PI address book in sync when you later modify the content of either database. (I just discovered this DTM sync trick this evening for Ko/PI, and it worked great with Ka/PI, too... )
Using the Import menu was what I tried at first, but the C3000 seems not to use the "old" xml format to store the builtin PIM apps databases, but the newer DTM Sharp proprietary format instead, which means that the Import menu is useless in your (and my) particular case, I think.
I'm sure some Zaurus guru will correct me if I'm wrong, anyway!
Hope this helps...