How Would I be Able to Obtain Multiple Visas?
If you wish to apply for multiple visas, you should complete as fully as possible one DS-160 visa application form and pay for that one visa application form thus allowing you to schedule an appointment for your visa. When appearing for your interview, you can request that the officer provide further assistance for your application for the other type of visa that you will be attempting to obtain. If the officer does indeed approve your request, then you will not have to pay any extra fees.
Bear in mind that that this double visa package is only allowable with a specific visa combination. The C1D and the B1/B2 visas are the permissible combination of visas to get at the same time.