In Master Concept it is possible to specify how your plant should be structured.
In Category settings you can specify that a category is an End Category. That means that no objects are allowed under an object with a category that is specified as an End Category.
Form version 19.0 you can also create named category structures that can be used in different objects designation structures.
In the Category Structure dialog, you create the category structure trees and store them as a named category structure. In the new designation configuration dialog you can specify what category structure should be used for what designation structure. It is also possible to set if it is mandatory to follow the structure or if users should get a warning when trying to create something that does not comply with the specified category structure.