This option allows you to indicate that all current diagnostics are to be suppressed. If there are no current diagnostics (for example, because the project has not yet been analyzed, or has been recently cleaned), no diagnostics will be suppressed.
Click Generate Local Baseline. This creates the suppressions for the project and automatically updates the location of the suppressions information. This location is visible below the Generate Local Baseline button. Then select the Baseline by Local Copy radio button.
Any changes must be saved.
When you close the Project Properties dialog, the project will need to be re-analyzed in order to suppress the diagnostics. Suppressed diagnostics can be seen by toggling the Show baseline suppressed diagnostics option in the Analysis Results/Diagnostics panel.