Go to the Settings page by clicking on "Settings" in the sidebar navigation.
Select the "Payment method" block. You will be redirected to the list of payment methods.
Click the "Create Payment method" button located at the top right of the page.
Add a category to the "Formula" by clicking the "+" icon button and fill in the name/describe the line item that will be listed on payslips.
If you want clocking records to be added onto the payslip, select "Clocking records".
If you want to add records by activity, select "Activity", and continue to specify which activity type and which payment method for that activity type.
Once done, click "Save" at the top right of the page and wait to be redirected back to the list of payment methods.