Conceptual Notions
Here are some definitions to give you a better understanding of the Import Creation command.
-  Mechanical import: mechanical  issued from a copy of another feature (the reference). It
          is a datum that reproduces the geometrical result of its reference. Note: An import can keep the link to its reference. In this case, it is called associative and can be synchronized with its reference.
 - External reference: import generated from a feature from another 3D shape.
 - Internal import: import generated from a feature of the same 3D shape.
 - External import: import generated from a feature from another 3D shape. If it is associative, it is called an external reference.
 - Contextual import: external reference in an Assembly context. It is associative in terms of relative positioning to a specific app context.
 - Rep rep import: import is created from one 3D Shape to another, but is not linked to a specific context. As a result, it does not synchronize in terms of position.