Whichever edition you select first from the xin1 gui, that edition should be complete from beginning to end, with the other editions appended on to the end. So, the first edition can easily be extracted by simply splitting it.
Another option is to use Graphstudio:
The chain would be Source > Haali > SMM Muxer > File Writer. As long as you don't have any decoders in the chain, SMM will mux whatever Haali sends it, and you can select the edition you want by right clicking on the Haali box in the graph. Click the "play" button to start the muxing (circled in red). The downsides: you lose chapters, but you can create those manually, and in some cases I needed to run the mkv through mmg to remux it:
