Regarding your question, at this time subtitling dialog does not support the use of line break symbols in the middle of a subtitle block. However, you can import (upload) subtitles with line breaks from a file in SRT format. Hence, the workaround - if line breaks inside subtitle blocks are absolutely necessary, you can:
1. Create and sync subtitles with the use of UniversalSubtitles.org.
2. Download them to your computer as a file in SRT format.
3. Edit this file in a text editor of your choice, inserting line breaks as desired (maximum 3 lines per block).
4. Save the file and upload it to universalsubtitles.org.
But she added:
And that's one big caveat, considering that Universal Subtitles / Amara is a collaborative platform where anyone can come up after you think you've finished your subs and edit them, e.g. to correct a typo you've made.
One caveat: once this is done, you will no longer be able to edit your subtitles on-site, with the use of the subtitling dialog - otherwise, the formatting will be lost.
Secondly if every contributor is complaining today about the new standard because we can't work properly, tomorrow it gonna be all the viewers complaining about the new standard if it becoming public (150 000viewers/month). We CAN'T read the subtitles properly this way.I'm not sure how many viewers PBS NewsHour videos get, but see the attached video screenshot of Watch Chen Guangcheng's Phone Call to Congress, Asking to Come to U.S, at 5:41, as presently on Amara: the Amara version is also embedded in the NewsHour site (as all other NewsHour videos are so far) in Chen Guangcheng Asks Congress Via Phone to Come to U.S (May 3, 2012)