This AskiaSurf feature allows you to merge historic waves using AskiaAnalyse's export sub-population feature directly from within AskiaSurf.
To merge waves:
edit menu, select merge waves.... The following dialog appears:
availability column. Unavailable waves are marked as not contiguous.next. The following step appears:
create a backup copy of the .qew file is selected. This backup will be saved in a folder called Surf Backups, in the same directory as the QEW.next.merge to begin the merge. A progress meter shows the progress of the merge operation. If you wish, you can cancel the merge during this process by clicking cancel.finish. The new wave that was created by the merge is displayed.