How do you create one entry for score and multiple parts

[fm42]

Hi! I have uploaded a few scores and parts but I never figured out how to have the score and parts in one entry. I do not mean the option where all the pdfs are merged to produce on file but the option where some files are underlined in the entry header and there is usually a more option to show all the files associated with that entry.
Ant help would be greatly appreciated.

[coulonnus]

Please provide the link to an example page.