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Once you have the required employee selected, Navigate to the Employee tab > Cost Allocations screen. Right-click in the area under Employee Cost Allocations > New Cost Allocation.
Typically the "Cost percentage of all components to a cost box" is used. This will split all of an employee's earnings, however there is the option to only split certain components as well.
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Select the Start Date for the costing split, the Percentage to be costed out to a different cost area and populate the cost boxes with the new costing.
