SEO's don't show in plan unfortunately. You may have better luck using the Wall End tool. 
Cheers,
Link.
Cheers,
Link.
Sami, I'm sorry, sometimes my brain just short-circuits. I was at home when I wrote that post and could not test, and my memory just failed. I seem to remember I got this to work sometime, but... (you should never trust anyone who gives advice for free 
)
(I've tested this one)
Go to the home story of your wall that should be cut.
Draw a wall of the same height, perpendicular to the first.
Make the second wall slanted to the cut angle you want.
Adjust the first wall to the second so they clean up in plan.
Then move the second wall to a hidden layer.
You can now check your floor plans upward. The first wall will be shorter as required on every plan. It will at least look correct with its Floor Plan Display set as Cut Only, might not look as good Projected.
However, it will not have the correct ending. To get that, you will have to change the cut fill of the second wall so the core materials don't clean up. This will give the first wall a correct ending.
The weird problem with this method is that it won't work in 3D. I don't know why, you'll have to ask Graphisoft. (They sure have some work ahead!)
To get a correct 3D image, you
Now you have it!
And if you change the design, as long as you keep the first wall adjusted to the second, it will work.
Sorry for not finding this at once.
And, I've only tested this with solid walls. Composites might be problematic. But with solids, it might even work to make wall #2 just as long as wall #1 is thick. Then you might not have to hide #2. But I haven't tested this in more complex environments. Please report back if it works for you.
(edited for spelling, several times!)
)(I've tested this one)
Go to the home story of your wall that should be cut.
Draw a wall of the same height, perpendicular to the first.
Make the second wall slanted to the cut angle you want.
Adjust the first wall to the second so they clean up in plan.
Then move the second wall to a hidden layer.
You can now check your floor plans upward. The first wall will be shorter as required on every plan. It will at least look correct with its Floor Plan Display set as Cut Only, might not look as good Projected.
However, it will not have the correct ending. To get that, you will have to change the cut fill of the second wall so the core materials don't clean up. This will give the first wall a correct ending.
The weird problem with this method is that it won't work in 3D. I don't know why, you'll have to ask Graphisoft. (They sure have some work ahead!)
To get a correct 3D image, you
Now you have it!
And if you change the design, as long as you keep the first wall adjusted to the second, it will work.
Sorry for not finding this at once.
And, I've only tested this with solid walls. Composites might be problematic. But with solids, it might even work to make wall #2 just as long as wall #1 is thick. Then you might not have to hide #2. But I haven't tested this in more complex environments. Please report back if it works for you.
(edited for spelling, several times!)
Still looking?
