Attaching External Files
Using the referenceAttachment node in GenerativeComponents is the most integrated way to import an external geometry file into your model. This node is restricted to attaching MicroStation design files (*.DGN) only. After creating a new model attachment, the new node is recorded in the transaction file and can be played and edited like all other GenerativeComponents nodes.
When the original attached model is changed or edited in MicroStation, replaying the transaction updates the file to its current state.