QB Issue Resolution:

You should establish ‘petty cash’ bank account which you maintain manually.  record the missing sales proceeds and cash disbursements thru that account.

Resolution for Issue 'How do I record cash sales when I have not banked them we bank 98% of all sales but occasional we will use cash taken and want to add as sale' available: Yes (Solved).
Source: Intuit Community forum.

How do I record cash sales when I have not banked them we bank 98% of all sales but occasional we will use cash taken and want to add as sale: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Bank Account
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Bank Account [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: