Assemblies can include any set of plant object. For example, a level gauge assembly might contain an instrument and five valves, including two ball valves.
When you place an assembly created in a drawing, the data and connection behavior is retained for the plant objects that make up the assembly. For example, if you added a manufacturer and model number to a valve before you made the valve part of the assembly, that data is retained in the assembly.
Tagging information is also retained. A question mark is added to the end of the tag, indicating that the tag must be adjusted to avoid duplication. After you insert the assembly parts, you can change the tags and assign unique values where necessary.