glennw

It is a Molding Polyline on floor 2 Roofs, Trim layer which is locked.

Uncheck Auto Build Terrain You should see this icon next to the cursor:

As for part 2 of your question. You can use the break tool to break the section line and pull the 2 (or more) sections independently.

Have a look in the help file for Symbol Molding. Instead of extruding a molding along a Molding Polyline, Symbol Moldings are 3D objects that are spaced at intervals along a Molding Polyline. You could also use a Distributed Path.

Try the Polyline Distribution Region and/or one of the other Distributed Objects tools.

Do you have Grid Snaps toggled on?

Have a look down the bottom of the Plan Defaults dbx for Opening Indicators.

It seems to be working in X16 for me.

I would normally just throw an invisible wall across the recess and auto build.

Can you post a plan

Can you be a bit more specific. What tool are you using to align what with what. I am guessing you might be talking about the Angle Snap Grid? But if so, have a look at Preferences>Edit>Snap Properties>Snap Indicators>Display Angle Snap Grid. And Preferences Edit<Behaviors>Primary Movement Method>Polar.

You can use a Molding Polyline with 2 moldings specified with appropriate offsets - one for the shelf and one for the rail.

I think you can do what you want by creating a Plan View with the Poche Walls option checked.

I think you need to post the plan

The short answer is no.

As well as the Heel Height ("off plate distance"), you also need to specify Boxed Eaves.

It's in the wall dbx. Look for Auto Roof Return.

Post the plan

Before delving any further you should clean up your drawing by finding and deleting the objects (a stove, invisible walls, etc) that are way out in the never never. Delete those invisible angled walls in the kitchen if not needed. Toggle on auto roofs. Make any edits as required by using the roof controls and other techniques and watch what happens in a 3D view as you work.

What format are you trying to export to?

Default Settings>Window>Window Defaults>General>Minimum Separation.

By this, do you mean that the floor level for level 1 is not zero, but it's real world height? What is stopping you from doing this? Time to post a plan.

Yes, make sure that you have Allow Wrap toggled on. As for drawing the stairs and getting them to wrap, make sure you draw them going down and not up (up is the default). Snap the stairs to the deck edge and drag them down by using Ctrl+drag (on a mac) - maybe Alt+drag on windows. It looks like Robert drew his stairs going down and that is why it worked so easily.

Just a wild guess In Preferences>Appearance>Toolbars, you have Child Tool Palette checked and the palette is opening off screen and/or behind another window.

Try this Assuming you are using auto roofs, trusses and auto framing Build a second floor In the Build Roof dbx check Ignore Top (2nd Floor) Build a room on the second floor the size you need for your platform (probably with invisible walls) Here is a very quick one I haven't got time now but read up on Attic Trusses which may do what you want