Using your words in a Google search
create a bar/line combo chart excel
If that did not work I would have tried a Google Groups search
which you might want to do also anyway;
create a bar/line combo chart group:*excel*
Combining Different Chart Types into a Single Chart
http://peltiertech.com/Excel/Charts/ComboCharts.html
BTW, there is a microsoft.public.excel.charting
which is where most such questions are asked. You needed
worry about getting an answer whichever group you post to,
but it makes it easier for others to find answers. Most people
here look at several groups -- charting is one group I don't look at.
Google Groups search see
http://www.mvps.org/dmcritchie/excel/xlnews.htm