There isn't an actual need to separate them. Log them both with the same item id. The only thing you need to make sure is that you do the form twice, to get credit for both required and bonus. The form allows you to put the same item id for both.

...
Regards,
Eric Fretheim
Assistant Prep Leader, 2015 October NaNoWriMo Prep Challenge

"It is perfectly okay to write garbage-- as long as you edit brilliantly." ~C.J. Cherryh

“No, writing 50,000 words in a month is normal. You are not crazy. This is not insane.” ~Teri Brown