I put both my assignment and bonus in the same entry as well. I log them in separate but use the same entry number both times. Here take a look at how I set mine up...

2016 October Prep  (13+) This blog will contain all my assignments for this year's October Prep. #2093054 by CheerFairy Dutchessbarbie.

Hope this answers your question. Remember the NaNo Write-A-Thon has started their sign-ups so head over there if you have not signed up yet.

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NaNoWriMo Write-A-Thon  (ASR) A NaNoWriMo fundraiser... compete as a NaNo writer or donate by sponsoring one! #1546312 by Jeff