You can delete materials individually or in bulk.
To delete materials individually:
Navigate to the Items screen and find your material in the Materials table. Click on the material to open a material card.
Click on the 3-dots at the top corner of the material card and select Delete from the drop-down.
To delete materials in bulk:
Navigate to the Items screen and go to the Materials table. Check the boxes of materials that you want to delete.
A Bulk actions menu will appear at the top left of the table. Click on it and select Delete from the drop-down.
For both cases, Katana will notify you if a material is currently used on any open orders or Product recipes. You can still delete materials even if they are actively used. On orders, a deleted item will be displayed with a strikethrough style.