Table of Contents line breaks

Hi

I've created my table of contents, including all paragraph styles used throughout the document that I need to show.

The problem I'm having is I'm using a hard line break to separate 'Impact Case Study' and the study title. I need some line spacing between the two and in different styles - otherwise I'd use a soft return.

This is showing up in the ToC as 2 separate bookmarks. I want to bring back the title to be next to Impact Case Study but this throws up errors when I do accessibility check in adobe acrobat.

Is there a way round this?