Change the color of a object's child or material

Questions
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1

I want to change the color of objects child means i want to change the color of materials by name Please do some help Here sample photo is attached for you refrencedescription
I write this code but it’s change the color of object but not the color materials or its child.

object.traverse( function ( child ) {
					if ( child instanceof THREE.Object3D  ) {
						// console.log(child.name +"test");

    					console.log("~ materials ~");
						console.log(child.material);
						//console.log(child);
						//console.log(object);
						
					if(child.name==='010001_Autoscale'){
						alert("010001_Autoscale");
						child.material.color.setHex(0xffff00);
					
					}
					}
				} );

This code just change the color of object

2

The material defines what the surface of the object looks like. This means that the material’s color is the object’s color.

3

its mean i just have option of change the color of objects?