If your company has part-time employees, there are several steps that you will need to take prior to processing payroll for them.
For hourly-rated or daily-rated employees, you will need to choose either "Hourly" or "Daily" under Employee Profile > Current Job Details > Rate of Pay first:
You can also refer to this guide to help you better understand the options under Rate of Pay field.
If part-time employees are on different working days compared to the full-time employees, you can customise their working days setting under Profiles > Company Details > Working Days Setting:
In payroll, you can choose "Regular Hours" or "Regular Days" item under Hourly/Daily Attendance tab and label the payment accordingly (for better tracking).