There is no client "IMport" command - Export and Import are TSM server commands, their primary purpose being to convey storage pool data to another TSM server. The TSM manuals are available at http://publib.boulder.ibm.com/infocenter/tivihelp/v1r1/index.jsp where the PDF instances of the manuals are particularly handy to have on a personal computer.
Your preview spec looks reasonable. I would, in general, perform the actual import (and, earlier, the export) one filespace at a time: the export and import functions are highly susceptible to interruption by tape errors, so minimizing your exposure to failure is a good idea. However, whereas all your data fits onto one tape, a wholesale import is warranted. Based upon the information reported by the import preview, you may want to check the destination TSM server to assure that all will load without conflicts or resource issues. Richard Sims