We have operated our own business for years with our own S-Corp. This company operates music and painting seminars but also includes other business activities we engage in- piano tuning, piano playing jobs, faux painting jobs and such. My wife is now starting a new business selling skin care products. Is there any reason why we cannot simply make this new business a part of our existing S-Corp by simply registering this with a "doing business as" form with the state? Our articles of incorporation simply state that the purpose of the corporation is to engage in general business purposes and does not limit these in any particular way. It does not even mention the type of business we engage in.