This is from a post by fearlessfrog and tells you how to edit your logbook.
There is a file called 'logbook.lua' and you can use Notepad++ to edit it and set the current mission in the campaign. It is located here:
X:\Users\(YourWindowsUsername)\Saved Games\DCS\MissionEditor
The section looks like this:
["campaign"] = "./mods/aircraft/Uh-1H/Missions/en/Campaigns/en_UN-Pilot.cmp",
["status"] = "Active",
["history"] =
{
[1] =
{
["stage"] = 3,
["mission"] = "en_UN-Pilot_03.miz",
}, -- end of [1]
}, -- end of ["history"]
..so you'd edit the 'stage' and 'mission' values to whatever you like.
Just follow this and you should be good to go.
You can also take a look at this post by Yurgan telling you how to do it.
https://forums.eagle.ru/showpost.php?p=2830501&postcount=181
SD