Split
From MB Wiki
At some point you'll hopefully (once again) be able to split an activity into two separate activities using the Map Player. You might want to do this if you did multiple activities, and forgot to "Stop" in between.
An alternative solution is to edit the MBX that the agent created. Assuming that you've already uploaded the merged activity, you'll probably find the a related MBX.gz file in C:\Documents and Settings\Application Data\MotionBased\Sent directory (on Windows XP). A shortcut to this is to press Ctrl+Shift+F while the Agent is open. This will pull up your folders.
Uncompress the gz and open the MBX in a text editor (e.g. Textpad, Notepad). Find the <event> that needs splitting, delete other <events>. Make two copies of the event you want to split, then remove non-wanted <activitySegment> and <timeSample> from those files and upload the two new MBX files.
For more detailed instructions, please see the FAQ section, Have you ever forgotten to press Stop on your Forerunner at the end of your run and so your distance and time is all wrong?
