How to let user choose multiple columns for graph builder

[#1]

Hi,

I'm just getting started in JSL coding, I am trying to create a script that can take user input (selection of y columns) and plot them in the graph builder. As of right now only the first Y column can be changed based on user's selection but the other 3 remains hard coded. How can I modify the code so that the graph builder will take multiple input selections and don't expect a fixed number of inputs? (Just like using the regular JMP GUI for Graph Builder where you can put multiple Y-values at ones).

Thanks!

[#2]

use a for loop and 

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ) ),
	Elements( Points( X ), Smoother( X ) )
);

for each ({col}, {:age, :weight},
gb << Add Variable( {col , Role( "Y" )} ));

[#3 · Accepted solution]

or maybe

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ) ),
	Elements( Points( X ), Smoother( X ) )
);

for each ({col,idx}, {:height, :weight},
gb << Add Variable( {col , Role( "Y" ), Position(1)} ));

... if you want to add all Y values into one framebox