This is different from the company that assembles the cars. The operating activities of the car manufacturer would include costs associated with assembling the car's doors, painting the car, putting wheels on the car, verifying that the cars meet specifications, and shipping the cars to dealerships to be sold.
Operating expenses vs. capital expenditures
Although operating expenses and capital expenditures (capex) sound like they're similar, or at least very closely related, they're actually two very different kinds of expenses that work together to help a company grow. Operating expenses, as stated above, cover all the day-to-day expenses that keeps a company running.
Capex, on the other hand, is all about investing in the company's future. These are expenses on assets that will remain in service for years. An example of a capital expenditure would be a new paint machine for a car manufacturing plant. Capex is generally deducted from corporate taxes over a number of years; operational expenses are taken in the year that it's spent.