Once the PI has worked with their ORSP Grant Administrator to set up a budget for the project, they can usually begin to make expenditures. All expenditures on a project must correspond to an approved spending category in the budget approved by the funding agency (as received in the award notification letter).
Typical ways to spend grant funds include paying people, travel and hospitality expenses, and the purchase of project-related equipment and supplies. There are a multiple mechanisms that can be used to spend grant funds, depending upon what is being paid for or purchased. Please visit the buying stuff page if you are confused about which form to use for your purchase.