If you are looking to control which items are imported onto orders for fulfillment in SKULabs you have three options.
In BigCommerce, set the product type to digital and SKULabs will skip it during order import.
In BigCommerce, set the products bin picking number field to "hide", and SKULabs will skip it during order import.
In BigCommerce, set the product's bin picking number field to "dropshipped", and SKULabs will flag that item as dropshipped, so you can skip it during fulfillment and in other areas of the website.