A. Write a separate proration formula and attach the proration formula to the element definition.

B. Embed the proration calculation within the payroll formula and attach the proration group to the element definition.

C. Attach retro event group to the element definition.

D. Only recurring elements can be prorated, hence create recurring element for proration.

E. Create input values as effective start date and effective end date to enable proration for that element.