Flat labor rate charged to Jobs

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Hello,

I have a question regarding payroll and how it is charged to jobs. We do not have any hourly employees. Currently we use Sage 100 Contractor to process payroll every 2 weeks and a few employees are charged to overhead but majority are charged to jobs directly (total employees is 27). For example, a project manager's payroll record would have 10 lines, one for each day worked in that 2 weeks. Each day would be 8 hours. Each line in the payroll record would have a job selected and the project manager cost code. So you would look at the job cost journal for that job and see a cost for each day. This cost obviously would include taxes and other benefits. 

What we are wanting to do is change this so that employees cannot see differences in pay rates. We want to have a flat rate that is charged to the job. This would help with employees not seeing pay rate differences and also help in the preconstruction phase when estimating jobs.  For Example, we have Tier 1 PMs that have a rate of $3,000 per week, Tier 2 PMs that have a rate of $2,000 per week. These are the rates we want hitting the job cost journal. The only way i can think to do this is to charge all employees to overhead and have some huge Journal Entry that charges jobs and offsets overhead payroll. This cannot be the best way to do this since people fall on and off jobs and it would be a huge entry.

Please keep in mind we do not use T&M billing or any billing capabilities of Sage 100 Contractor. 

Does anyone have some suggestions or methods they could share for this?