This screen is used to generate a whole party of characters in a few steps.
"Insert" button: Click on this button to insert a character in the scroll list. All the characters you insert in this list will be randomized to create your party.
"Scroll list" Double click: Double click on one of the characters in the list to enter the class, level and generation parameters of this character.
"Generate party" button: Click on this button when your party is completed. This will start the party generation. Generating a party will take some seconds.