Can Employee Waiver The Notice Period - ZIP Download

Please help on this,
If an employee is on his/her probation period and served his/her notice period of 13 days to the management and the rule is to serve the notice period for a Month, so what would be the appropriate action I can take an HR? Please help me out.
Thanks and Regards.
Shivani Bhatia

Hi All,
I am working in one of the organization in HR department, i want to revised the Notice period of all the employees and release a letter to all employees,company is reducing the NP 15days from 30 days.. Please help to provide me the format.