We are general contractors/remodelers. We use weekly time sheets to track each employee's labor for each customer:job. We invoice based on an estimate that does not include the actual time our employees spend on the job, but is based on an initial estimate that includes a flat fee for the work to be completed. So we do not bill labor (or materials for that matter) directly to the customer.

I want to be able to include our employees' labor in a job profitability report or profit and loss report for a job.

How can I include our labor costs (COG) in the total cost of the job to determine a jobs' profitability without directly billing the customer for their time?