I also tried this, and it works! I don't know if this is the most efficient way to parse data though?
path = "C:\R&D Data\JMP";
fileName = "Sample Table.jmp";
dt = Open(path||"\"||fileName); //open data table
Current Data Table()<<Select Rows (Index(1,10));
dt<<Subset(Columns(Index(1,4)),Rows(Index(1,10)), Linked, Output Table Name ("New Table"));