Use this dialog box to specify a property type for a new property when you export data to a geospatial format.
For example, if you export the .COLOR property to a new feature class in the target data store, you can specify the data type for that feature class as STRING.
Once the property type has been selected, it cannot be edited. To change the property type, you must create a new property.
New Property Data Type is available for only three AutoCAD properties: .COLOR, LINETYPE, and LINEWEIGHT.
Select the data type for the new class property from the drop-down list.