combo chart

Is there a way to create a combo chart with 2 lines + 2 vertical bars? I have two brands that I want to display the units and revenue by time periods. Now I can do the stack bar to show 2 brands (use brand as column series and units as column value). when I drag the revenue to the line value, it adds up the revunue for the two brands. Is there any way to show line for each brand?

thanks,

Wenchi Wang