With every protocol you purchase, you will be able to see the complete list of fields and methods. We always try to cover all available fields and methods per the protocol definition (the RFC or equivalent) and the customer has the ability to review the protocol definition and have us add anything we might have missed (or any extensions we're not aware of, etc).
You can also open the module browser which will take you through the beSTORM decision tree showing all relevant test combinations covered as seen in the following screenshot:
Regretfully, we're not able to provide the full specs for all protocols prior to purchase for competitive reasons. However, when it comes for DHCP, the total number of combinations is around 600 Million.
If you wish to know what protocols we cover in the DHCP module please see the PDF report below