Yes it is possible to add discounts while creating a bill.
Simply enter under the Account details section the discount account (you may create one if you don’t have one under the Chart of Accounts) and enter the discounted amount in the Amount field.
Resolution for 'account details issue: 'Does Quickbooks online let me apply discounts when i pay a bill?' available: Yes.
The account details issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the account details issue yourself by looking for a resolution described in the article. If it is a complex account details issue or you are unable to solve the issue, you may contact us by clicking here or by using other account details support options.
For more information about resolving issues related to account details in Quickbooks/QBO or to get support for the issue 'Does Quickbooks online let me apply discounts when i pay a bill?', click the link below: