What is the significance of the phrase "unless they have elected otherwise" in this context?
In this context, the phrase "unless they have elected otherwise" provides an exception to the general rule that judges of a High Court in any Province holding office immediately before the commencement of this Constitution shall become judges of the corresponding State's High Court. This means that if a judge does not wish to be transferred to the new High Court, they can opt out and choose another course of action.