Not sure I understand what you mean - .psv files? You mean .psz files or .csv files? If you want to have separate files in the end, I don't know why you want to have them as chunks in a single project, and if you want to have them as one big project, I don't know why you want to split it into several files. Is it just because you want to use the batch processing? Then, in any case, you can just save the project under different file names, open each file and delete all the chunks that you don't want to have in it. Alternatively, you can always have several instances of PhotoScan running (of course, that might create memory usage conflicts if all instances are in a memory-intensive processing step at the same time, so the sequential batch processing would be preferable).