This document explains how to change the package of a processor expert project, for example, from S32K144 100LQFP to S32K144 64LQFP. It does NOT explain how to change processor derivatives (e.g. S32K144 to S32K142).
1. Assuming that the project is opened and active, go to Components Library View and click on Processors
2. Expand the repository folders and double click on your processor (e.g. S32K144)
3. Select new package (e.g.S32K144_64) and click on finish. Now the new variant will be added to your project
4. Go to PinSettings component and click on Switch Configuration. This action will change the pins configuration for new package and will discard the original pin configuration.