It's fairly easy. Open up the character save file in a text editor, notepad if you don't have anything better, and search for the [Campaign] section and, more specifically, the [LogEntry] sections. They'll look similar to the following:
Code:
[Campaign]
name(),basepoints(275),disadlimit(-80),quirklimit(-5),basetl(9),loggedpoints(10),otherpoints(0),totalpoints(10)
[LogEntry]
date(199X-XX-XX),campaigndate(),charpoints(10),caption(Character Creation)
{\rtf1\ansi\ansicpg1252\deff0{\fonttbl{\f0\fswiss\fcharset0 MS Sans Serif;}{\f1\fswiss MS Sans Serif;}}
\viewkind4\uc1\pard\lang1033\f0\fs17 +5 points for picture, +5 for background story\f1
\par }
[LogEntry]
date(2009-10-01),campaigndate(),charpoints(0),caption(caption text, nyerk)
{\rtf1\ansi\ansicpg1252\deff0{\fonttbl{\f0\fswiss\fcharset0 MS Sans Serif;}}
\viewkind4\uc1\pard\lang1033\f0\fs17 notes text, nyerk
\par }
There will be one whole [LogEntry] section for each log entry. Cut and paste the whole [LogEntry] section, including the trailing blank lines, to move a log entry from one character to another.