In the free version, you can mark an individual item as a quote item in the product advanced setup.
In the Plus version you can assign the quote status to one or more product categories in the premium version. You would create the categories in WooCommerce. Assign the products to those categories as you would normally in WooCommerce. Then you mark those categories as quote items. You can still remove an individual product from the category by going to the advanced setup of that product.
Please note: to check the check this to apply the categories before saving every time you want to apply this setting. If you want to remove all categories, then delete all the categories from the select box, check the “apply the categories before saving” checkbox and save setting.