Hi.
This feature is present in Istram Ispol software.
I would like to have 2 new columns in the "Alignment layout tools" called "Mark point (Set)" and "Mark point (Get)", where we can put a "Mark name".
The concept is similar than the "mark points" in the subassemblies using "set" and "get" mark points.
Sample:
Alignment 2:

The start station of the entity 1( of the alignment 2) will be got from the mark point (p5) which is from another alignment entity, which has the mark name "p5". Obviously, the entity 1( of the alignment 2) must be a fixed entity.
Another alignment, for example "alignment 3", has an entity (Nº4) with "Get mark point" = "m1", so the start station of this entity will be got from the start station of the 2.1 entity (from alignment 1).
Even, if there is an option to get the entity data such as (radius, length,...),--in case both entities were 2 arcs, 2 spirals or 2 tangents, this data could be copied to the another entity, not only the start station.