You probably don't really want your investment (passive) income on your Schedule C as that gets self-employment taxes applied. The income needs to go to the correct Schedule to be taxed correctly.
Having said that, if you wish to label an income source on Schedule B you can. When entering the account form (1099-DIV or 1099-INT for example) in the "Received from" box you can enter information to ID the source for information purposes. For example, for a 1099-INT from Wells Fargo that is an LLC account you could type in "Wells Fargo (LLC)" or your business name/nickname/abbrev.
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