How to connect 3 Siemens s7-1200 PLC in a HMI

Explain how should i connect 3 siemens PLC in a HMI

If we have profinet network then, We need to create 3 connections in HMI for each PLC according to their IP address. Nor create tags for respective PLC for communication. OR In tia portal go to HMI and made three connections of individual plc and create tag according to your requirements and connect them and use them