That's a great question! The good news is you can have separate lists for these two businesses. In fact this is the next step we would suggest. Are the contacts for both business already uploaded into your account? Are they are separate excel files and need to be uploaded? If they are already in your Constant Contact account, you can search for your specific contacts and add them to a new list. If these contacts have yet to be uploaded, I would suggest having a separate file for each business. Having them separated like this will allow you to easily create separate lists through the upload process.