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Disclaimer: Back up your library or don't care about the outcome.

Updates to Steam's library folder infrastructure means you can simply exit Steam, move the acf and common subdirectory between library folders, and restart Steam.

1. Find out the game's app ID in the store.

Half-Life 2 is on the store at http://store.steampowered.com/app/220/ so its app ID is 220

2. Open the two library folders' SteamApps directories.

   For example, c:\Program Files\Steam\SteamApps and d:\SteamLibrary\SteamApps.

3. Move appmanifest_[app ID].vcf from the old SteamApps directory to the new SteamApps directory.

   For example, appmanifest_220.acf is Half-Life 2's app manifest.

4. Open the appmanifest_[app ID].vcf with Notepad or your favourite text editor and look for "installdir" "[directory name]" where [directory name] is the next directory your need to move.

   For example, "installdir" "Half-Life 2".

5. Open the common directory in both SteamApps directories.

   Again, c:\Program Files\Steam\SteamApps\common and d:\SteamLibrary\SteamApps\common

6. Move the game directory named as above from the old common directory to the new common directory.

Completing our example, copy c:\Program Files\Steam\SteamApps\common\Half-Life 2 to d:\SteamLibrary\SteamApps\common\Half-Life 2.

7. Restart Steam.

If you want to just move all your steam apps you can probably just copy all the acf files and common sub-directories.