How to mirror a group of objects?

How can I mirror a group of objects together? when I have a copy of the objects and than I mirror them. The object did not mirror the way they should be mirror.

Attachments


ok! I just found a way. Some of you may know it but just to share with you guys. Select all the object that U want to mirror it and hold down ‘shift’ and select any one of the object to be your parent object and than ‘ctrl p’ to apply parent. There you go!