Hi,
Follow theses steps:
1. Select profit and order date and make a bar chart.
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2. Convert profit to running total from quick table calculation, as waterfall model is formed on running totals.
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3. Now select Gantt Bar from the Marks pane.
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4. Add the grand total from analytics pane.
5. Add a calculated field, to get the bar size of profit for month as -SUM(Profit) and drop it in size shelf to get the size of profit/loss
6. Now add grand total to the chart.
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7. Now add the category to color shelf.
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Hope this helps you.