If I am using Zoho Expense and Zoho Books, where can I see the total reimbursement amount that I owe my employees in Zoho Books?

You can know the total amount you owe to your employees by checking the balance of the Employee Reimbursement account in Zoho Books. You can view the balance under (Reports > Accountant > Account Transactions > Account name: Employee Reimbursement). If the Employee Reimbursement account balance is Zero, you have paid all the amount owed to your employees.