Sum PLP Register Column for all employees

In People Planning, is there a way to sum all the values in either the PLP register or calc plan for all employees to get a total to calculate an allocation. My client would like to allocate a Pension Pool by the Employee’s Wage / Total Employee Wages. I am trying to find a way to calculate the Total Wages for all Employees using Allocation Methods as they run by RegisterID/CalcPer. Any ideas.