Connecting HVAC plant loops to equipment in Zone groups and Air loops by hand can be a bit of a chore in large models. Here's a neat productivity feature which allows all connections to be made in a single click! 

To connect Plant loops to HVAC loops and Zone groups simply navigate to System level, select all loops and zone groups to be connected and press the Connect components toolbar icon. 

You can read more details on this time saver in the Program help.