In NV2 payroll you can create your own accounts and define how the account calculates the amount accrue and withhold. Also create an account to use as a paid account.
Under Payroll > Canada Payroll (or USA Payroll) Employees > Account Setup click the window pull down button and choose Paycode. Enter your definition in the Percentage Base field and enter a rate. The Paid accounts should use a Time/Quantity of Input with a rate of 1. When paying the paid accounts, enter your amounts to pay in the pay list for the individual in the particular payrun in the time/quantity field.