solver

Not sure what you are asking. Thermo Ply may not be a stock material so you might need to make your own. See the links above for more info.

Please use Home Designer instead of Chief Architect. Answers often depend on which title (Suite, Pro etc) and version (2018, 2019 etc) you are using. You can help everyone by adding that info to your signature (see below for how to turn them on) by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left. Doing so makes it always available, and keeps others from having to hunt for it. And, turn on signature display too. ---- Resources for self help: The built in Help System (always a good place to start) Getting Started Knowledge Base YouTube

The Home Designer website is a good place to start your search for answers.

Please post images (screen captures) directly -- no need to make a PDF of an image. This makes it easier for others as an image shows in the forum.

Answers often depend on which title (Suite, Pro etc) and version (2018, 2019 etc) you are using. You can help everyone by adding that info to your signature (see below for how to turn them on) by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left. Doing so makes it always available, and keeps others from having to hunt for it. And, turn on signature display too. ---- Resources for self help: The built in Help System (always a good place to start) Getting Started Knowledge Base YouTube

Try the Gable/Roof Line tool.

Something wrong with the audio.

Draw it manually. You might also create an Open Below room there and change the roof overhang to use in auto building the roof.

I see you said Pro 2020. You can help everyone by adding that info to your signature (see below for how to turn them on) by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left. Doing so makes it always available, and keeps others from having to hunt for it. And, turn on signature display too. ---- Resources for self help: The built in Help System (always a good place to start) Getting Started Knowledge Base YouTube

That's part of the wall below. You can make it invisible, or set the wall below to Balloon Through Ceiling Above.

Search the Library for materials. See the links below too. And I see you said Pro 2021. Answers often depend on which title (Suite, Pro etc) and version (2018, 2019 etc) you are using. You can help everyone by adding that info to your signature (see below for how to turn them on) by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left. Doing so makes it always available, and keeps others from having to hunt for it. And, turn on signature display too. ---- Resources for self help: The built in Help System (always a good place to start) Getting Started Knowledge Base YouTube

Why do you wish to hide it?

Can you post an image of what you want? I hope you did not really read that somewhere. Use a soffit, slab, or custom backsplash to form the seat. Wall Niche. And if you update your signature this info won't need to be added to each post.

What you want to change is the ceiling height. Draw what I suggested above. Divide the space with an interior wall where the ceiling heights change. Open the room specification and change the ceiling height. Generally, wall heights are controlled via ceiling height. Roofs build over rooms, so they are also affected by ceiling height.

Did you do what I suggested and build a new model? Why are you trying to adjust the exterior wall heights?