It would be helpful if you would include the version of Carrara you're using. I'm going to assume you have Carrara 2...everything but the bones (which is new with version 2) should also work in Carrara 1.x... here's what I do, first I do a save as. This way I have the original, in case i really screw-up. So if my orginal file is "Batman.car" the saved as version would be "Batman a.car" By deleting animation, I think deleting keyframes would work. On the time line, they are the little upwards pointing black triangles. Click on one and it should become "hollow", i.e. filled with white with the Carrara yellow selection color around it. At the top of the timeline is a series of buttons, click on the one with the little trash can icon. That'll delete the keframe. Shift-clicking allows you to select more than one keyframe and you can also hit your delete key to eliminate keyframes. Another way to get rid of keyframes on objects is to select an object and in the properties tray, select "Still" on the Animation Parameter area. You'll be given a dialog box, if there's a slider, set it to zero, if there isn't, it'll saysomething about all the animation being deleted, click okay. If you're working with bones, the delete all keyframes manually and then select the skeleton and in the skinning menu choose send bones to reference position. That should get you back to a starting point where you can create a new animation. As far as copy-pasting objects, Have no problems with that. But I have gig of RAM, so it could depend on how large/intricate the objects you're copying are. First I would save my file and then select the object and then choose copy from the edit menu and then go over to the file and make that the active window and choose paste from the edit menu. You could also close the file you copied from, and then open the file you're be pasting into. hth