This handy little tool will allow you to put multiple Gamecube games on a single disc with a boot selection menu that will boot on your modded Wii. It can be used with multiple region images e.g U/J/E on the same disc and set to your region
Download MultiGame ISO Creator
HERE
This requires .Net 2.0 Framework to be installed on your system (google)
Double click the .exe to launch the application
Select the region of your Wii.
Click Add ISO and brows for your iso or gcm
follow the procedure untill all your games are in the list
You can rename games just click on the game and press F2 (or you can double click)
Whils the game is highlighted you can move them up and down in the list using the appropriate named buttons
Tick the Shrink checkbox next to games that you wish to compress (handy if you need more space)
Shrunken Images are placed in the Compressed Images folder in the application folder and can be deleted after your iso is created
Click Create MultiGame ISO button.
Name your Image and click ok (select an area you can find it)
Burn with Imgburn and enjoy!!
Will not work with multi disc games like the Resident Evil's