In Stitchex all products, sales and production are arranged into seasons. You can switch between your seasons using the select drop-down at the top of any page. A season has a name (a short title, such as "Spring 18", works best), a start date and an end date.
Hiding a season
When a season is over, it can be marked as ended. This has the effect of hiding the season's products from various parts of your Stitchex account, for example, hiding discontinued products when building sales.