AssetDatabase.SetLabels

Description

Replaces that list of labels on an asset.

using UnityEngine;
using UnityEditor;

public class AssetDatabaseExamples : MonoBehaviour
{
    [MenuItem("AssetDatabase/Set Vegetation Labels")]
    static void SetVegetationAssetLabels()
    {
        //Search the Assets folder for all assets with "tree" in its name and then add "Vegetation" Label to every asset that we find
        foreach (var guid in AssetDatabase.FindAssets("tree", new [] {"Assets"}))
        {
            var path = AssetDatabase.GUIDToAssetPath(guid);
            var asset = AssetDatabase.LoadMainAssetAtPath(path);
            AssetDatabase.SetLabels(asset, new []{"Vegetation"});
        }
    }
}