Property set data that is used to generate schedule tables is created from property set definitions attached to the object. Property set definitions establish object properties that can be dynamically linked to schedule tables.
You can also use classifications to define the type of objects to which to apply the property sets. That means that you can create a certain property set for objects classified as air terminals, and another for objects classified as VAV units.
Property set definitions can be either style-based or object-based. Style-based definitions apply to all objects of a specific style, while object-based definitions apply to individual objects. For example, a Manufacturer property will probably be the same for every instance of a particular damper or MvPart style, so it should be in a style-based property set definition. However, a RegisterNumber property is different for each instance of a damper, so it should be in an object-based property set definition. Your strategy for creating style-based versus object-based property set definitions should be based on how often information might change.
AutoCAD MEP 2023 toolset provides a group of property set definitions based on industry-standard schedules. When you use schedule tags and schedule tables, the supplied property set definitions are loaded into your drawing. You can merge, edit, and delete property set definitions. You can share property set definitions between drawings. You can also customize the part catalogs to include part properties that can be added to property set definitions. For more information, see Property Set Definitions.
To create your own object properties within a property set definition, you can write your own property definition formula. For example, to estimate the cost of a particular length of pipe, you can create a definition property set formula such as length x $2.00 per foot = cost.