It is always better to give proper notice to all employees concerned or obtain their consent/sign a bipartite agreement, notwithstanding whether or not there is enough provision in the law. This is especially required to satisfy the provisions of the "Law of Contracts" as everyone is governed by certain terms and conditions, whether oral or written, implied or explicit. Moreover, any attempt to tinker with the basic pay would automatically attract EPF/ESI/Gratuity and other Acts. Therefore, proper notice and consent are necessary to disprove any mala-fide intentions, if any.
Nevertheless, it is beneficial to bifurcate the emoluments into acceptable components such as Basic, DA, HRA, CCA, Bonus, Pensionary benefits, and so on. Different Acts define salary/wages/remuneration with different connotations. A caution - Employees/Unions should study the proposals with utmost care, sensing repercussions.
Regards,
Kumar S.