You need {theTotal} barcode numbers to identify your existing product range.
There are two licence options available to you:
a) you can licence two GCP-11 prefixes to meet your needs.
Each GCP-11 which will enable you to create 10 Global Trade Item Numbers (GTINs) to identify your existing products and outer cases. GTIN is the official term for a barcode number.
b) If you anticipate that your product range may grow substantially in the next few years (to more than 20 products & outer cases) a GCP-9 licence may be more economical in the long run.