I've written about Indexed Charts on my blog: http://qvdesign.wordpress.com/2012/05/09/the-indexed-time-series-chart-the-forgotten-technique-at-least-by-most-qlikview-developers/
It includes a .qvw and a 'how to' so it may help you.
I love Indexed Charts - let's get them used more in Qlikview!
All the best,
Matt - Visual Analytics Ltd
Qlikview Design Blog: http://QVDesign.wordpress.com