Move multiple keyframe

Hello. I have build a fairly complex animation.

I need to insert something at the beginning of this animation. To this I will need to slide all the animation down.

How can I move all my animation down on the timeline? Thanks.

create keyframe and move anchor, That drags the frames

Thanks for the response. On the file in question this technique does not work. Could that fact that I had deleted all the default keyframe (0f) during my process have something to do with that?

However this technique seems to work on a new file where I had several objects animated where I had not deleted the default keyframe (0f).

Thanks for the tip.