You can always create accounts and enter negative numbers to take care of withholding tax.
In the example below, i have crated non inventory items for the various withholding taxes. They all end up in different account. And luckily, contact details are displayed when you open the account like below
So i can just copy all relevant entries for the period for each withholding tax type/account and prepare a cheque to pay it, and in the case of withholding tax receivable compile a report or statement fro every customer demanding your withholding tax credit certificate.
I didn’t take my time to create the items that why they are showing the suspense account, i just created them to explain things to you to know how it works.
You can use this to monitor Withholding tax Payable and Withholding tax receivable.
Bottom line is creating your own accounts to take care of every withholding tax type