Additional Holiday pay calculated with a paycode linked to Overtime and other elements

We have several clients who have the need to process additional holiday pay at an enhanced rate of 13.33%, against the HMRC 12.07%. We require the ability to be able to create a paycode, which calculates as a % of the Gross pay Totals for Overtime, Sunday rates etc.

We need to be able to create a bespoke % rate, link paycodes, and set a calculation to view the total of gross pay across the pay codes identified and make a payment into the period payslip.

The manual process at present is very time consuming and can be prone to error.