About Custom Properties With Points
Points have many default properties you can use to identify them. However, if you have custom data that does not match the existing properties, you can define your own properties. These properties are called user-defined properties.
About Importing and Exporting User-Defined Property Values
If you have a point file that contains custom properties, or you want to export custom point properties, you can set up a point file format and then use it with the Import and Export commands.