An audit source is a way to track progress and create separate criteria/work paths for different sets of content before assessment.
You might assign a source by channel, by auditor, by folder structure, by sprint, etc. Sources are not available to the filter process, so should only be used as an organizing principle.
Audit sources can be created during the import of content via CSV (recommended) or on the dashboard. If created via the dashboard the source will need to be tagged manually to the relevant content.