The correct answer in the thread below will help you to loop a symbol, so what I would suggest is making the animation you want to loop without affecting the rest of the timeline a symbol first. Then follow the steps in the thread below and that should solve your situation. : )
Let me know if that helps!
Thank You! Works perfectly, now I just need to tweak it a bit.
Great! I'm glad I was able to help! If you need any more help please don't hesitate to ask! : )
how can i access the link you posted its now broken