Hi Green,
Editing sonar track-points is a little slow in the current release, but it is an order of magnitude faster in the current beta, which will be released as an upgrade within the next month.
At the moment there is no way to save an edited sonar log such that you can import the same data - with sonar - into another ReefMaster workspace. We are working in a function that will allow the moving of any asset type (tracks, user maps, projects) from one workspace to another, but this won't be in the next release.
If you just need to export the tracks with edited depths, you can export them as CSV, GPX or Humminbird track (HT). Just right click the track(s) in the asset list and choose Write to File, then select an export format and save the tracks. Note that to retain depth in GPX files you need to choose either Humminbird or Garmin as the GPX target. You can then import these tracks into another workspace, and you will retain your edited depths. You won't, however, be able to view sonar.
Matt