Withholding amount adjustment at payment

Summary:

We are using withholding at payment time, is there anyway we can adjust withholding amount during quick payment before it was automatically deducted ?

Content (please ensure you mask any confidential information):
We are using withholding at payment time, is there anyway we can adjust withholding amount during quick payment before itautomatically deducted ? We have this requirement because sometimes there is rounding or different calculations of WHT with the supplier

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):