Here is a simple example of one way to do it
Names Default To Here( 1 );
dt = Open( "$sample_data\big class.jmp" );
// copy the names from row 2-6
NameCpy = dt:name[Index( 2, 6 )];
dt2 = New Table( "copied", New Column( "new name", character ) );
dt2 << add rows( 5 );
// copy to new table
For( i = 1, i <= 5, i++,
dt2:new name[i] = NameCpy[i]
);
If you actually have physical rows that are selected, you can easily get their row number with a:
dt<<get selected rows
Jim