WYSIWYG Editor for a task manager (checklist)

Question

Hi,

I am looking to develop an html task manager where users can have multiple tasks in groups. I currently allow them to define their tasks in a textarea. E.g.

:Group 1

task 1

task 2

:Group 2

task 3

task 4

:Group 3

task 5

task 6

I am looking for a WYSIWYG editor that can make it more intuitive for users to enter many task or a paste a complete checklist from another place (e.g. word document).

One direction I thought of was CKEditor with some plugin or extension. But I don't know how to do that.

Anyone has any ideas on how to approach this?

Thanks,

Assaf