How do you enter multi-line codes for Game Boy Color gameshark?

It took me a while to figure this out but I finally did. After you've gone to the game you want to make a code for, enter into the list of already existing cheats. Pressing select brings up the menu for "ADD", "EDIT", and so on. Select "ADD", input the name of your code, press start. You should now be in the empty box for code entry. Input the first line of code and once your done you simply hit the select button. It looks like it clears out the first line of code but in reality its moving to the next empty box. Once your done the second line of code hit select again. It'll read all zeros but it is the next line for code entry. Once you put all your codes in just save like you would with a single line entry. Worked for me after fooling with the GameShark for a few hours. Hope this helps. Peace.