Sources contains records of anyone or any business entity that you purchase goods from.  This would be vineyards, winemakers’ supply houses, testing services, online retailers, etc. You could choose to ignore this feature if you want, the other features in CellarMetrics don’t depend on information being stored here. This area does, however, provide you with a place to reference this type of information, and that is probably worth the trouble of entering the data. Later on it might be helpful to be able to know where you got those great Pinot Noir grapes in case you’ve forgotten.

See New Source in this guide for information on adding sources.