Pin objects in hierarchy that I currently work on?

When you have really, really many objects in your hierarchy, but there are only like 4-5 objects that you currently need to work with (for example when composing a scene, and you are setting up a group of trees and stones), is there a way to pin these 4-5 objects in the hierarchy so that they are still visible, but all other objects are not or hidden?

Or how do others handle such situations?

Using the search box again and again to locate the object is okay, but on the long run still really time-taking.

Thank you for the help!