Components like a bonus, incentives, salary advance etc., which are paid once or change month after month are Variable Component. (one-time payment or deduction component)
Go to Settings >> Salary Components and click on New
Abbreviation (Short form)
Round off Value
As per your requirement
Is FBP component
Part of CTC
Is an FFS component
Note: After creating the component, you will need to assign it to employees by navigating to Employees tab > Payroll Settings > Salary Components and clicking on Pay Allocation so that this becomes a part of their salary.
To know more about allocating salary components, please read How to allocate a pay component in the salary structure of employees?