[SOLVED] Priority on projects and subprojects

Hi

When you have a project with some subprojects, if I define an important priority (ex: 100) on the main project but priority for subprojects is kept on medium priority (ex: 500), what priority is taken during the calculation planning process? Medium or important?

In fact, I want to know if I need to update the priority only on the main project or on all subprojects too to increase the priority?

Thanks