dt << select whee (substr(:name,1,1)=="A");
dt2 = dt << subset(invisible,selected columns(0), selected rows(1));
This will make the data table invisible to the user, however, it will still appear in the JMP Windows List. You can substitute "Private" for "Invisible" and the new data table will be invisible to the user and the JMP Windows List.
Make sure you close the data tables when you are done with them,
close(dt2, nosave);
Jim
Jim