An assembly is an object containing other objects. Hidden line is computed between objects when they are in an assembly.

Elements: Select up to 63 elements to include in the assembly.

When an assembly is opened, its content is dropped into the interactive stack. All the objects created after will be included in the assembly when it is be closed.

Assembly: Select the assembly to open.

All the elements created after to "Open Assembly" selection are added to the opened assembly.

The content of the assembly is dropped in the interactive stack and the assembly is deleted.

Assembly: Select the assembly drop.