Use Sorting bins, which are containers for shading nodes (materials, textures, and so on), to help you organize and track shading nodes in your scenes.
A default Master bin contains all shading nodes in your scene. You can add any number of additional bins to a scene and assign nodes to one or more of those bins. By strategically naming the bins, (for example, wood, metal, doors, foliage), you can quickly and more easily locate shading assets to work with them.
For more information on how to organize nodes within your sorting bins, see Organize render nodes with Hypershade sorting bins.