Subscribe to The Chicago Manual of Style Online
Q. “The question is: how would you ask Mr. Jones what concerns he has about placing his order today?” Is the question mark correct?
A. Yes, but the construction is ambiguous and could be improved by editing the sentence into a statement—an indirect question—which would end with a period: “The question is how you would ask Mr. Jones what concerns he has about placing his order today.” (Note that in your example, we would capitalize “how”; see CMOS 6.42.)