I think "//OutlineBox[@helpKey='Oneway Report']" is what you are looking for:
Names default to here( 1 );
dt = Open ( "$Sample_data/iris.jmp" );
(ow1 = ( dt << Oneway( Y( :Sepal length ), X( :Species ) ) ) ) << Journal;
(ow2 = ( dt << Oneway( Y( :Sepal width ), X( :Species ) ) ) ) << Journal;
(ow3 = ( dt << Oneway( Y( :Petal length ), X( :Species ) ) ) ) << Journal;
(ow4 = ( dt << Oneway( Y( :Petal width ), X( :Species ) ) ) ) << Journal;
{ ow1, ow2, ow3, ow4 } << Close Window;
//By text:
( Current Journal() << XPath("//OutlineBox[contains( text(), 'Oneway')]") ) << Prepend (Page Break Box());
//By helpkey (better):
( Current Journal() << XPath("//OutlineBox[@helpKey='Oneway Report']") ) << Prepend ( Page Break Box() );
Edited to use the helpkey attribute (more robust than title), thank you Justin for the links.