Thanks :)
See the "Creating combined charts with the XML Editor" in the Solutions Recipe Section of the Dynamic Web Charts support page:
dynamic-web-charts/
Actually, I got it sorted by editing the xml by hand (that made sense in my head, but of course all the methods are by hand!!) using the wizard and xml editor seemed to break it. So that is now done. But, I can't seem to get each of the lines to be a different color at the moment. I have changed the color wheel color settings to be the right colors and have also tried adding a child color tag for the <point>, but all to no avail. Could you advise anything (other than trying to find something I am competent at!) Thank you :-)