Create the Group of PCBs
Note: For the group of PCB parts, we use the Direct Selection method.
Hide the casing and air parts.
Deselect all parts, to ensure the medium chips are no longer selected, and then select the three PCB parts.
Right click, and select Group > Create Group from the menu.
Enter PCB as the group name. Leave the Group Type as Geometric.
Click OK.
Note: The PCB group is created and populated with the three selected board parts.