Yes. When you start a new season that season will become the active season. Anything you do will be added to that season. Once you are finished go back and make your current season the active season. Please don’t forget to make your current season the active one again.
You may also want to consider creating an additional page (Manage -> Add Additional Page) and uploading an Excel or Word Doc or simply copy/pasting information on that page. This will save a lot of time and will be easier to access for visitors on your website.