A bit of help if you please with Simulation - creating a Rigid Group

A bit of help if you please with Simulation
Using Solidworks 2020 Premium
It has been about two years since I had to run a study and looking for some help.
I have a vehicle chassis, kingpin in front, 4 axles in rear
I have created points at the center of the kingpin and at the center of the tires at grade.
I know I have to create a rigid group, but I can’t find out how,
How do you create a rigid group?