QB Issue Resolution:

you should have a cash type bank account and you fund it

a check is just a data entry form, write a check on the cash bank account just do not print it to record the expense

Resolution for Issue 'I pay some of suppliers such as telus etc cash. How do I get the option to change from a cheque to cash?' available: Yes (Solved).
Source: Intuit Community forum.

I pay some of suppliers such as telus etc cash. How do I get the option to change from a cheque to cash?: 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.

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