Hierarchy System for Equipment 
Use
You structure a system into superior equipment and sub-equipment by assigning individual pieces of equipment to another piece of equipment. This piece of equipment becomes the superior piece of equipment for all the individual pieces of equipment.
To represent the installation of the sub-equipment in the superior equipment, the following methods are available:
Prerequisites
You must create equipment master records for both superior and sub-pieces of equipment because the assignment of equipment is performed there.
Features
When you create equipment hierarchies, you can use the following additional functions:
The associated superior and sub-pieces of equipment form a structural unit. This is why it is possible to copy certain data (for example, the planning plant or the responsible maintenance planning group) from the master record of the superior piece of equipment into the master records of the sub-pieces of equipment.
When dismantling an equipment hierarchy, you also have the option in the system of representing an installation, dismantling or replacement that has already taken place some time ago, with the correct date and time. In this way you can be sure that the sequence of equipment usage periods in the equipment usage list is correct.