Hops ibu's after flameout

[beerhound]

Hello,
How do you put into beersmith and/or figure how many IBU'S a beer has when all your hop additions are after flameout?

My neipa calls for hops at flameout.
Hops at 20 minutes after flameout.
Hops at 30 minutes after flameout.
I'm supposed to get to 35 ibu's but not sure how to enter it into beersmith or even figure it up.

Any help would be appreciated.

Thank you

 

[BOB357]

See your duplicate post.