How are elements attached in Advance Steel?

For easier modeling of structures Advance Steel has a new option for attaching elements.
An element can be attached geometrically by one or two work planes depending on the type of the element and relative to one level.
A level is defined by two work planes; one defines the base of the level and the other one defines the upper part of the level.
When you create a structure with levels in the "Project Explorer", each created element will be attached to the active level.

A level is active when the name is highlighted (in bold). It can be activated either by double clicking it or right clicking it and selecting "Activate".

When the level is active, the work planes that define the level will become active.

To see the elements that are attached to a level, right click on the level and select "Mark elements". The elements that are attached to the level will be marked.

If you forget to activate the level when defining an element, you can later attach it to the desired level.
The wall and column, whether they are concrete or steel, will always attach to the work planes that define the level and then to the level where they belong.
The slab and beam, whether they are concrete or steel, will always attach to the work plane that defines the upper part of the level and then to the level where they belong.

In the next example you can see that the wall and beam are elements that are not attached to Level 2.
To properly attach elements to the desired level, you must follow two steps:

Right click on the base work plane, "Level1", and select "Attach elements".

To check if this element is attached to the "Level 1" work plane, right click on the plane and select "Mark elements" and you will see that the wall will be marked.

Note: The same principle applies to elements made of steel.