First, enable developer mode in Odoo. Then, follow these steps:

1. Navigate to Settings > Technical > Database Structure > Models.
2. Select the model where you want to add the new field.
3. Create a new computed field for calculating the late time.
   • Set the field type to match your requirement (e.g., Float for hours or Integer for minutes). For example, 23.25 -> 23:25
   • Define the compute method in Python to calculate late time by comparing the scheduled time with the employee's check-in time.

Open the application (e.g., Attendance) where you want to add the late time calculation.

Click on Studio in the top-right corner.

Drag and drop a new Computed Field from the Studio panel into the desired location on the form or list view.