The Estimate By Customer Report can be found under Reports > Estimates > Estimates By Customer.
Once selected it will bring you to the screen shown below:
RED - Here you can choose the Date Ranges for the report.
GREEN - This drop down will allow you to select specific Laborers to show on the report. (all are selected by default).
BLUE - If your company has multiple branches you can select these in this Drop Down.
YELLOW -Don't forget to click "View" to see your Report.
PURPLE - This button will allow you to Export to CSV file.