I'm a newbie on Qlikview so hopefully this is really easy to answer!
I'm bringing 2 years worth of data into a combo chart e.g. Apr-2008 to Mar-2010, but I actually only want to show the latest 12 months at one time i.e. April-2009 to Mar-2010. However when I check the Max Visible Number box and enter 12 on the presentation tab it brings back Apr-2008 to Mar-2009.
If you switch your sorting to be Descending on that field, it should be the last 12. I don't know if there is a simple way to pull the last 12, but sort them in Ascending order.
A more versatile way to do this is to use Set Analysis on your expressions: