solved

[#1]

solved

[#2]

Instead of opening the reports in the new window, could you just load the platforms directly?  Using this method you should have the entire platform available:

Names default to here(1);

dt = Open( "$Sample_data/big class.jmp" );

New Window("Reports",
	H List Box(
		Bivariate( Y( :height ), X( :weight ) ),
		Oneway( Y( :height ), X( :age ) )
	)
);

[#3]

solved

[#4]

I don't know of a straight forward way to take an existing report and save the script from it without a couple steps in between.  But you can build the new window with a for loop:

Names default to here(1);

dt = Open( "$Sample_data/iris.jmp" );

New Window("Reports", hlb = H List Box( ) );

cols ={:Sepal width, :Petal length, :Petal width};

for(c=1, c<=n items(cols), c++,
	hlb << Append( Bivariate( Y( cols[c] ), X( :Sepal length ) ) )
);

[#5]

solved

[#6]

See Line Up Box display box.