Right now, when we create an offset aligment in Civil 3D, we can unlock the alignment start and end station and we can type a particular start and end station.
InRoads also have this for offset alignments but in addition has "offset alignment by entity" so, it means that the start station value is from a choosen entity which takes its start station and the end station of the offset alignment is taken from the end station of another entity.(in the case of C3D, would be subentity).
I think that we could do that currently in the same offset alignment object, where the entity could override the typed start station.
In case that the choosen entity was removed in the parent alignment, then the typed station overrides automatically the "by entity" method...
We could do easily with the entity ID and subentity ID available in the API.
