Multiple animation

I am not sure what you mean. Could you elaborate your question?

I want to put multiple animations on a model I'm animating

Unfortunately, your question is still so general that I don't quite understand it. You can apply as many animations to your character as you like. However, 300 frames is the limit for the length in the free version "Cascadeur Basic". In the Pro version there is no such limit. Or maybe you mean copying movement data from one character model to another? Then the attached short video clip could be useful.