Yes, if you want to be sure an extra specific amount is taken from each check. The question is somewhat confusing because of your statement 'This is not an additional amount.' Line 4(c) is used for that specific purpose to help when not enough withholding is being taken.
If you know the extra amount you would like to have withheld for 2025, you can divide that by the total pay periods left in the tax year and enter that amount without changing any other change on your W-4P.
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