The quota for S Pass applies across the board to all companies in a sector, with no exceptions. Companies are not allowed to use their excess Work Permit quota for S Passes.
The S Pass quota is set at a particular level to ensure that local jobseekers will have a more level playing field and better job opportunities. The Work Permit quota and S Pass quota are therefore not interchangeable.
Instead of hiring more S Pass holders, you are encouraged to consider hiring qualified local candidates to strengthen the Singaporean core in your company.