There is a single interrupt for a port on which several pins can be enabled to generate the interrupt. You will have to read the pins/port to decide which one did fire the int.
See attached for configuration.
Thank you for reply. I have checked the project shared by you. I need help in programming the entire functionality. I mean I need help in defining the Timer/Counter and Pin interrupts for four Ultrasonic Sensor Modules. Even if given for only one module, it will help me a lot. Thanks in advance.