How do I add a new panel to a Project Properties dialog?

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Create and register the panel (here for Java SE projects):

@ProjectCustomizer.CompositeCategoryProvider.Registration(
    projectType="org-netbeans-modules-java-j2seproject")
public class BlaPanelProvider implements ProjectCustomizer.CompositeCategoryProvider {
    public @Override Category createCategory(Lookup context) {
        return ProjectCustomizer.Category.create(
                "Bla",
                "Bla",
                null,
                null);
    }
    public @Override JComponent createComponent(Category category, Lookup context) {
        return new BlaPanel();
    }
}

See also Project Properties GUI for custom project templates and Adding New Tabs to the Project Properties Dialog in NetBeans IDE.