For Oracle Grid Infrastructure 18c, if you want to use Oracle Solaris Projects to manage system resources, you can specify different default projects for different Oracle installation owners.

For example, if you have an Oracle Grid Infrastructure owner called grid, and you have two Database installation owners called oracle1 and oracle2, then you can specify different default projects for these installation owners such as mygridproj, myoradb1proj, and myoradb2proj respectively with their own resource controls and settings.

Refer to your Oracle Solaris documentation for more information about configuring resources using Oracle Solaris Projects.