I recommend opting for the creation of a custom model for the following reasons: First, consider configuring a model with two fields, namely "Day Cost" and "Meter Cost." This configuration provides flexibility for future adjustments. You can either keep these values static or modify them as needed.

Next, build a second model to define the daily meter readings for each employee, including the date of travel. This model serves as a record to track all journeys. Lastly, incorporate a custom field in the payroll module to retrieve data based on the new journey model. By following these steps, the computation of relevant data will occur automatically, and you also have the option to switch to a batch model if required.

If you need further assistance, please feel free to contact me at Mohit Nakrani, mohit@axialtek.co.uk.

Best regards,

Mohit Nakrani