This must be possible, but I'm not finding how to do it via any search string I can make up.
I have a sequence in which a cardboard carton pops out of a machine, drops onto a conveyor (where a text talk balloon appears), then box and balloon slide along the conveyor, and move out of the frame. 
I need to have several boxes pop out and move off stage over a minute or so -- how can I simply re-use all the stuff in the original box + balloon -- that is, just loop the activity several times?

One way I have done the sort of thing I think your talking about is 
Assemble the props
Animate a prop to achieve the animation you want it to repeat
When the prop gets to the end of its animation 
      Set its Display visibility to invisible
      Move 1 frame forward and move the prop back to its original position
      move 1 frame forward and make it visible again
      Go into the timeline editor and select all the frames of the animation in the Collect clip
      Right click on the collect clip and choose Add To Perform and then give it a name
      Now go back to frame 1 right click on that prop you added the performance to and click Remove Object Animation

Now you can right click on that prop and select Perform and choose the animation you added to it.
You can repeat that Perform as many times as you want


That is what I did with these waves (They also have morph animations)
But to get those morph animations to repeat over and over using a single set of them I animated each part till it got to the position where the next part of the wave takes over. Set it invisible, move it back and make it visible. Then I set that as a performance on the prop and that way one prop performs its animation over and over for each wave that comes in to the beach.
Explained the props very simple there. Each wave has 3 props. 1 before it white washes. 1 where it is washed and I where it is water flowing up and down the beach






i7-3770 3.4GHz CPU 16 GB Ram   
GeForce GTX1080 TI 11GB
Windows 10 Pro 64bit

Here are some screen shots of the things I said in case you have difficulty finding them

The red box I added shows where to make the object visible or invisible as it animates




This one shows where you selects all the frames and then add it to the prop as a performance



This one shows where you can perform the performance.
Notice there are 2 that I added.
You can create an animation and add it to the prop as a performance.
Goto frame 1 and remove the animations
Create another different animation and add it to the prop as another performance.
Repeat that process to create all the different animations you want the prop to be able to do.
When done that you can save the prop so whenever you reload it it will automatically have all those performances for you to use however you want.











i7-3770 3.4GHz CPU 16 GB Ram   
GeForce GTX1080 TI 11GB
Windows 10 Pro 64bit

Delema - many thanks. Amazing sequence you've done there, clearly with a ton of ocean observation behind it. Lighting, motion, music all working together...
When I get time to think, I'll go over your methodology and experiment. My current project is so tight on time that I simply went ahead and brute-forced it by creating a new prop + attributes for each repeat -- but a lot less is going on in my scene than in yours.
VERY much appreciated.
(Interesting that there's no built-in support for looping in CTA3... though I have to admit that it's not trivial coding that would have to go into it.)

OOPS, Silly me. I was reading this from the latest post section and forgot to check that you were using iClone
Sorry this applies for iClone although surely there is something similar in Crazy Talk Animator? I do have that but don't use it much.
I got that first and then stumbled on iClone and bought it. Not saying Crazy talk is not good, I just prefer 3D to 2D


i7-3770 3.4GHz CPU 16 GB Ram   
GeForce GTX1080 TI 11GB
Windows 10 Pro 64bit

Not to worry. It looks to me as though much of the underlying workflow is analogous, iClone > CTA3....

And, yes, 3 is better than 2, but we're stumbling headlong into a rush assignment and our production guy identified CTA3 as the most promising for quick development. Next week, I'll take a long look at iClone.
My bad for not prepending my topic heading with CTA3.

Yes I just checked in my CTA3 and all those things are there. Just a little different

i7-3770 3.4GHz CPU 16 GB Ram   
GeForce GTX1080 TI 11GB
Windows 10 Pro 64bit

Use the Prop Key Editor to do the animation. 
Then, 'Collect Clip' and save the animation to reuse it later.





YouTube Tutorials Here