WorkGuru Projects (or Jobs) are made up of Tasks and Products. Tasks are for internal staff to put time against (not subbies) and Products are anything that we buy, sell or use from stock. Products can even be theoretical items like a per kilometre travel charge, or a consumables charge.
When you create a Project, you set an expected number of hours per task, and an expected quantity of each product, which gives you your budget for the project elements, and the project as a whole.