You're trying to save a JMP table as a PowerPoint? I'm not sure Save Presentation is a valid message for JMP data tables. It is intended work with report windows to save the graphs and tables in the report to a PowerPoint. See the Scripting Index for details.
However, if you really want to do that, you can get the data table as a report object and then use Save Presentation. If you only have 1 column selected, it will just print that column to the presentation:
:A_B << Set Selected(1);
rpt = dt << Get As Report;
rpt << Save Presentation("$TEMP/Table.pptx");