If you wish to do delete a product, Here is an article from Shopify that can help you, https://help.shopify.com/en/manual/products/add-update-products#delete-a-product.
Please note that product deletion would remove it permanently from your entire Shopify storefront.
If you just want to hide specific products on the WSH Order Form & ReOrder, here are two articles that can help you with the same.
How do I hide specific products from specific customer groups on the WSH Order Form & ReOrder?
How do I show specific products to specific customer groups on the WSH Order Form & ReOrder?