You can view the barcode number, Product name, Price, and units of the particular product.
After checking the price of the product you can add that particular product to the invoice by clicking Add To Invoice and that product will get added to the invoice.
If stocks are not available in the central inventory system and the product is available in the store then a popup will be displayed stating that you still want to add that product if you select yes that product will be added to the invoice and if you select No then that product will not get added to the invoice. Please refer to the below screenshot: