Chart w/two different data sets

I have a set of data which is an set of data points taken through out
a 24 hour period.

The sets are broken up into 3 sets (10 hours, 10 hours, and 4 hours).
I'm trying to create one bar graph which combines the 3 sets into one
24 hour x-axis.

I'm having problem getting the data ranges set. How do I select data
ranges from 3 seperate areas?

I can reformat the data but I need to do this with a lot of different
data sets. I'm trying to set up the graph once and reuse it multiple
times.

Any idea?

Thanks