Assignment group in Sidebar Discussion

[Tania_Mitra]

While starting a discussion in sidebar, how do I get the option of Add assignment group along with Add Participants? 

[Sebas Di Loreto · Accepted solution]

@Tania_Mitra 

You may be able to find your answer here.

[Michael Todd]

I have the same question as the OP. I have reviewed the linked article but can't see an answer to the original question. Does anyone have the answer to this?