Overlaying Report Types

[#1]

I want to overlay two report types - Stacked and Line charts. My reason is that I want to create a chart of "hours needed" for all projects company wide by month for an entire year (hence a stacked chart) but I want to overlay available man hours on top of that so I can visually see where I'm short workers.

Having visibility into future labor needs is critical for senior management as our hiring cycle can take months.