You can create Other Input Types using the Payroll->Configuration option. So, when you are calculating the payslips, this other input will show to enter the value

Check the link for more details https://www.cybrosys.com/odoo/odoo-books/odoo-book-v15/odoo-payroll/other-input-types/#:~:text=Payslip Other Input Types menu,Code%2C and Availability in Structure.

In Odoo, a payroll manual dedication is a deduction that is made from an employee's pay for a specific purpose, such as a charitable donation or a loan repayment.

To set up payroll manual dedications in Odoo, you will need to:

Install the Payroll module from the Odoo app store.

Set up the payroll manual dedication in the payroll system by creating a new manual dedication rule.

Define the details of the dedication, including the amount to be deducted and the frequency with which it should be deducted.

Assign the manual dedication rule to the relevant employee or employee contract.

When you process a payroll run, the manual dedication will be calculated and deducted from the employee's pay.

I hope this helps! Let me know if you have any further questions

From inputs