Hi, esther. There's more than one way to accomplish that. If I understand you correctly I think I'd probably just save a pz3 with the new prop within Poser and then open it in Carrara. If you don't want to do that because maybe you've already done a lot of work on the file within Carrara then I think I'd just save a pz3 with nothing but the new prop from within Poser and then import that into your Carrara scene and reposition it. I frequently have two pz3's open in Carrara and so far it's worked fine.