What is the process for making an exemption for certain trades or businesses from Union taxation?
The process for making an exemption for certain trades or businesses from Union taxation, as per the given context, is not explicitly mentioned. However, it can be inferred that it may involve a law passed by the State Legislature which has to receive assent from the President after being reserved for his consideration. Additionally, if the law involves fixation of rates and other incidents of such tax through rules or orders made under the law by any authority, it must also obtain the previous consent of the President.