Inserting keyframes into begining of movie


I’m working on a movie with a lot of tweens. I need to insert some keyframes and tweens at the beginning of my movie but I want to know how to do this without altering the rest of my movie? There’s probably an easy answer I’m not aware of.

I don’t know what else to do but extend the end of my movie to create space for frames at the beginning. There must be an easy trick to do this?

Any help is much appreciated.

Thanks! :thumb: