Makes creating more than one prefab at once possible

PrefabUtilityMenuItems.cs

using UnityEngine;
using UnityEditor;

public static class PrefabUtilityMenuItems
{
	[MenuItem("Tools/Prefab Utility/Create Prefabs From Selection")]
	public static void CreateFromSelection()
	{
		var selections = Selection.gameObjects;
		if (selections == null || selections.Length == 0)
		{
			EditorUtility.DisplayDialog("Prefab Creation Failed", "No game objects selected", "Gotcha 👌");
			return;
		}

		var folderPath = EditorUtility.SaveFolderPanel("Save prefabs to folder", string.Empty, string.Empty);
		if (string.IsNullOrEmpty(folderPath))
			return;

		var creationAttempts = 0;
		var successfulCreationAttempts = 0;
		foreach (var selection in selections)
		{
			creationAttempts++;
			var success = false;
			PrefabUtility.SaveAsPrefabAssetAndConnect(selection.gameObject, $"{folderPath}/{selection.name}.prefab", InteractionMode.UserAction, out success);
			if (success)
				successfulCreationAttempts++;
		}

		EditorUtility.DisplayDialog("Prefab Creation Finished", $"{successfulCreationAttempts} out of {creationAttempts} saved as prefabs.", "Ok good to know 👍");
	}

	[MenuItem("Tools/Prefab Utility/Create Prefabs From Selection's Children")]
	public static void CreateFromSelectionsChildren()
	{
		var selections = Selection.gameObjects;
		if (selections == null || selections.Length == 0)
		{
			EditorUtility.DisplayDialog("Prefab Creation Failed", "No game objects selected", "Gotcha 👌");
			return;
		}

		var totalChildren = 0;
		foreach (var selection in selections)
			foreach (Transform child in selection.transform)
				totalChildren++;

		if (EditorUtility.DisplayDialogComplex
		(
			title:		"Prefab Creation",
			message:	$"Are you sure you want to create {totalChildren} prefabs?",
			ok:			"Yea",
			cancel:		"Actually no",
			alt:		string.Empty
		) != 0) return;

		var folderPath = EditorUtility.SaveFolderPanel("Save prefabs to folder", string.Empty, string.Empty);
		if (string.IsNullOrEmpty(folderPath))
			return;

		var creationAttempts = 0;
		var successfulCreationAttempts = 0;
		foreach (var selection in selections)
		{
			foreach (Transform child in selection.transform)
			{
				creationAttempts++;
				var success = false;
				PrefabUtility.SaveAsPrefabAssetAndConnect(child.gameObject, $"{folderPath}/{child.name}.prefab", InteractionMode.UserAction, out success);
				if (success)
					successfulCreationAttempts++;
			}
		}

		EditorUtility.DisplayDialog("Prefab Creation Finished", $"{successfulCreationAttempts} out of {creationAttempts} children saved as prefabs.", "Ok good to know 👍");
	}
}