Not sure I follow your post but I think I resolved it on my own.  I had not noticed before but when completing the liability check there's an "Expenses" tab just to the left of the "Payroll Liabilities" tab.  I can just split the business expense in Expenses and the employee liabilities portion in Payroll Liabilities.  They are both linked to the appropriate tax line mapping and the total shows up in the check/ACH field.