(Note: 1. Double counting is permissible for the CB College/major and the minor requirements under the 4-year structure.)
According to ARRO regulations (http://www6.cityu.edu.hk/arro/content.asp?cid=165):
4.8.1 Students with a home major may choose to declare a minor, which is optional, in accordance with the procedures announced by the University. A minor requires 15 to 18 credit units. Credits earned to fulfil the minor requirement cannot be used toward meeting the requirement for a major and/or other minor(s) taken by the student.
4.4 Double counting of courses is permissible between the major and college/school requirements, as well as between the minor and college/school requirements. However, the credit units would count only once toward the total credits attained by the student, regardless of the number of requirements the course serves to fulfil.