Combining a bar graph and line graph with 2 sets of data

I'm sure this is an easy fix, but maybe my head cold is affecting my brain or something cause I can not figure it out! My boss wants a graph that shows:
1 - how much steel we purchased each month from each of our supplies (3 different ones) in a bar graph
2 - the average cost of steel purchased from each supplier each month in a line graph within the bar graph

is that possible? I attached the worksheet that I put 3 months worth of data into, trying to figure this out!

anyone have step by step instructions for excel 2013?

Hi,

Where do you have the average cost of steel purchased in the file attached?

cbatrody - if you look under Arcelor, for example, it's just at the bottom of each "cluster" ie: all the Jan PO's are listed then there is a line with price and total qty if that makes sense

Something like this?