Inserting a new chunk of frames into the middle of a composition

[jonh82451177]

I hope this doesn't sound like a bizarre workflow. Let's say I'm doing consulting working with a client on an animation for a how-to video on thier website. I work with the client to carefully gather requirements for the animation in several rounds of meetings. I've done a few wireframes, even threw together a prototype. It's all thumbs up. Time comes to review the work and the client - for what ever reason - decides we need to insert something that they didn't realize they needed until they saw the end product. We talk about what exactly they need and it looks like we need ten seconds of content inserted about 30 seconds into a 4 minute animation with lots of things going on. Is there an easy way to just insert the addition frames to get that additional 10 seconds?

[ShiveringCactus]

When I've had this in the past, I found the best way is to bring the comp into another, then split the layer where needed, and use Time remapping with a hold keyframe to cover the gap.  Then I can add whatever I need in place.  But it does become trickier if the background and other animations need to animate during that 10 seconds. 

Easiest option, you could switch styles for this 10 seconds, creating a distinction which would capture the viewer's attention?   Something like drop in a newspaper looking slide or similar.

If you absolutely have to maintain the look and have other animations going on, best option is to precomp everything not connected to the existing timing, then manually shift the remaining layers.  And speak to your client about agreed number of revisions.