Adding subheader to index item text

Hi all,

I've searched the forum already, but all posts rearding this topic seem to have been deleted.

I'd like to add a sub-header to the index item text, using a different font size and style (I am using the York template).

Any ideas on how to accomplish this? (I've customised parts of my template already, but haven't found a solution on this one yet).

Would really appreciate the help. :-)

Thanks & best,

Almut