All you need is a copy of your P&L for a 12-month time period.
Step #1: Using a P&L for a full year, enter the dollar amounts of line item expense totals into the appropriate "bucket."
Step #2: Then, scroll down to see the totals for each bucket. Use those as a baseline, a starting reference point, when making your assumptions and "best guess-timates" when using any of The ROI's online projecting calculators.
Now, you will be prepared to start using The ROI's specialized online forecasting and "what if...?" calculators.
And yes, this is another FREE online tool for retailers, available only from The ROI.