To link an existing allowance or deduction to an employee go to Employee - Modify Employee Details - Allowances .
Click Add for the Add New Allowance screen.
From the resulting Add New Allowance screen select the required allowance or deduction, then click GO
Enter the Usual Units to be paid to the employee each pay period.
The usual units becomes the default each pay period after filing the payroll.
To not pay the allowance or deduction on a regular basis leave the usual units blank.