Per Timesheet Allowance is calculated as 1 unit per each timesheet submitted (e.g. Fixed Monthly Fee or Weekly Allowance).
On the Rate Code Entry screen, set the Rate Code Type to Allowance.
When setting up the assignment click the Add Bill Allowance button. From the Allowance Type drop down, select Per Timesheet and from the Allowance Rate Code drop down select the appropriate rate code. Then, simply enter the allowance fee in the Rate field.
Once the timesheet has been submitted the system will add the extra allowance as a new rate line on the timesheet.
As this is a billing allowance it will appear on the Sales Invoice.