In some situations you may need to add properties to an existing SHP file. For example, you're Map Building feature contains a TaxID property, but the SHP file doesn't.
The following steps describes how to add a TaxID property to a Building feature that originated as a Shapefile. Note that the Map project contains a Buildings feature that has a TaxID property as shown:
1. Import the SHP file into a clean DGN and take note of the feature properties. Ensure that you've mapped the feature to a corresponding feature in your schema that contains all the necessary properties. In this example, Buidings.shp is missing TaxID and is mapped to Buildings feature with a TaxID.
2. Export the same data to shapefile. Note that the properties being exported are obtained from the Buildings feature in the Map project and includes the TaxID.