Second Thread Subject Line?

[Batwoman]

I have seen a few forums that when you create a thread you have the option to use a second subject line. I am assuming this is a plugin. If so can someone please tell me what one it is. I have been looking all over the place and can't seem to find it.

To be clear it adds a second subject line to only a new thread not each new post within a thread.

Thanks!

[Alanna 🥀🖤]

www.proboards.com/library/plugins/item/8

[Batwoman]

Thank you @khristian !