To export the test cases into SpiraTest, SpiraPlan or SpiraTeam you will need the following:
1) The SpiraTeam MS-Office AddIn. This can be downloaded from http://www.inflectra.com/SpiraTeam/Downloads.aspx - this adds the Spira toolbar into MS-Excel.
2) The SpiraTeam Excel template. This can also be downloaded from http://www.inflectra.com/SpiraTeam/Downloads.aspx - this excel template describes the format that you need to use so that it knows which columns correspond to which SpiraTeam fields.
The documentation can be found at: http://www.inflectra.com/Documents/SpiraTestPlanTeam%20Migration%20and%20Integration%20Guide.pdf