- How can I continue to work on this project - without having to open each XML file individually!
Go to your long list of files in the target language Files window, right click one of the files and the last option is "revert to sdlxliff".
- How do I complete this project, i.e. proofreading, export and update main memories?
Not sure what you mean. Can't you go on now that you know how to re-open the merged sdlxliff file?
(Edited to change re-convert to revert.)
[Edited at 2013-06-03 18:35 GMT]