Using the SOLIDWORKS Center of Mass Tool
Use the Center of Mass tool to show the global center of mass of your parts and assemblies. Use Insert Model Items to display them in drawings. The Center of Mass feature will stay at the top of the feature tree and indicates the global center of mass.
If you want to show the Center of Mass at a specific place and time in the feature tree, use the Center of Mass Reference Point (parts only), which indicates the center of mass at that point in the model. This reference point can be used to drive dimensions in the model.