Can you please tell little more technical details?
1. What is the application you are aiming at Signal flow level (higher level in terms of data flow)?
2. What kind of data you are going to transmit? What are the sensors and where are you connecting those sensors?
What is desired is an application that can set three alarms, the alarms will send a signal to each PSoC to "enable" the circuit of a sensor (although it is not known that sensor will be used), then when the sensor returns a signal to the PSoC this will send the notification to the phone.
But it is required or is looking for the possibility that the three microcontrollers are connected simultaneously to the telephone.
* There is one sensor for each PSoC.
Your application is feasible using time multiplexing. Please go through the code example "BLE TIME MULTIPLEXED GAP CENTRAL" from the link below:
Please go through it and let us know if it suffices your requirement or not.