建议你仔细再通读全文。 如果你这方法可行， 早就一堆人自己给自己开薪水了。

“However, if your total OW from your employers exceed the　current OW ceiling,”

If you are concurrently employed by more than one employer, all your employers must pay CPF contributions based on the wages payable to you. This is because the Ordinary Wage (OW) ceiling is applicable on a “per employment” basis.

However, if your total OW from your employers exceed the　current OW ceiling, you may apply to limit your share of contributions. There will be no change to the employer’s share of　CPF contributions. All your employers will have to pay the employer's share of CPF contributions on the OW at the prevailing rate, subject to the OW ceiling.　As contributions are payable monthly, the approval cannot be backdated and it will only take effect once CPF Board’s approval has been granted.