You can create a step-level suppression from within the Investigate Screen by selecting the failed step and then clicking on the Suppress button.
The following screen is then displayed.
The Suppression Key contains information on the failure to be suppressed, including the object name, error type and the message to be suppressed.
Firstly, select your custom filter set from the first drop-down. By default, the option to create a script-level suppression is selected. You will therefore need to select the Step suppression type.
Your screen should now look like this.
Click on Create, and the suppression will be created. In future playbacks, if Testimony encounters this same error again it will mark the step as passed as attempt to execute the rest of the script.