Tidal measurement or measurement in rapidly varying flow situations often require splitting a series of transects into different measurements. This can be done more efficiently in QRev by using a couple of features that are only available through key strokes.
From the main window:
ALT-u in the main window will uncheck all transects
ALT-s will toggle the save button to only save checked transects
The steps to split a series of transects into multiple measurements would be to