When creating a new season, initially there are no raw materials visible there. You can use the tool 'Set Season Visibility' to make raw materials from previous seasons visible. Price in Zedonk is season specific - so you can change the cost of the raw material variants and it will not effect previous seasons.
Making an existing Product visible in a season will automatically make the Raw Materials associated with that Product visible. Alternatively you can make raw materials visible here in order to create new products...
The list will be showing all your materials from all your existing seasons.
I.E. Filter to see only the materials already visible in a specific previous season
Save is automatic
Select [Make VISIBLE] to confirm
For prices to pull through correctly, you must ensure to have the previous season set correctly in your Season Settings