The system currently allows a maximum of 2 additional group members (Publishing). If you wish to add additional members you have two options.
1. Add two or members to a single box e.g. Member One and Member Two.
2. Create an additional artists for each band member and set the alias to 'Alias Hidden' - this means their name wont be displayed as artists on the release but you can set them as being songwriters (authors, arrangers, lyricists or composers). This method is also the one that should be used if you intend to pay the individual group members separately.