dt << Stack(

	Columns ( columns ),  // the columns to stack together

	Source Label Column ( "name" ), // to identify source columns

	Stacked Data Column ( "name" ), // name for the new stacked column

	Keep ( columns ), // the columns to keep in the data table

	Drop ( columns ), // the columns to drop in the data table

	Output Table ( "name" ), // name for the new data table

	Columns( columns ) ); // specify which columns to include in the stacked table

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );

StackedDt = dt << Stack(

    Columns( :weight, :height ),

    Source Label Column( "ID" ),

    Stacked Data Column( "Y" ),

    Name( "Non-stacked columns" )( Keep( :age, :sex ) ),

    Output Table( "Stacked Table" )

);