If you have AC11 you can use
any view
as a reference. Thats the whole point of it!
(Copying polylines is so ArchiCAD 10....
)
Right click on the view you want to use and select 'Show as trace reference'
Study 'trace and reference' in the help file for further information about all the options.
See here for how to use more than one view as a reference.
http://archicad-talk.graphisoft.com/viewtopic.php?t=20319
(BTW, Put your AC version and specs in your signature before someone moans at you!)