Payroll Method Step question

Hello, I’m trying to create a Paid Time Off (PTO) payroll control. To accrue PTO, Navision’s knowledgebase document assumes that there is a Method Step called AMOUNT IS QUANTITY. I have not found it in the Cronus database and I am not sure what function in Payroll Calculation codeunit I should refer to for this Method Step. Can anyone point me in the right direction? Thanks in Advance