Is it possible to add a second target language to a project but to keep the segmentation of the same documents (putting together, separating) of the first target language?

I have a project to be translated in 20 languages. In some documents I have to put segments together. At the moment, I have to do it for each document in each language, but how can I avoid to do it for each language. Can I create a project with only one target language, than review my segmentation(putting together, separating) and then add the other languages with keeping the segmentation of the documents already integrated in the project?