Hey @Norawat
There is currently not a way to mirror the updates, however there is a cool feature where you can at-mention another pulse in your update to duplicate the comment in another pulse (by typing @ and then the name of the pulse)
For example, if I want my update to appear on the item called ‘SAMPLE’ on the department board, I can @ SAMPLE and choose the item called SAMPLE on the Department Board. This update will then appear on both the item that you are writing the update on as well as the SAMPLE item that you mentioned.
Hope this helps!