Hi Jiawen,
In case a vat-return results in a payable you might initiate a tax payment directly from the VAT Return view.
Another option is to generate and to allocate a tax-payment via bank statement processing in resulting payment allocations.
The payment amount will have to be allocated via Customer/Supplier to the defined Tax-Authority and 'Payment Allocated to: Tax Payables or Receivables'.
In the resulting tax payment you can then select open vat item(s) resulting from specific vat-return(s) for clearing.
Hope this clarifies,
Frank