You can manage Employee Promotions using this document.
To record an Employee Promotion go to
Human Resource > Employee Promotion > New Employee Promotion
Select Employee and add all details to be updated to Promotion Details table.
Promotion document can be submitted on or after Promotion Date. Once submitted all the changes added to Promotion Details table will be applied to the Employee. ERPNext also keeps a record of all promotions of the Employee in the Employment History table in Employee document.
Next: Employee Skill Map