You can convert object data into linked records in an external database table.
To convert object data to a linked database table
To select from a list of field names in the object data table, or to rename the fields, click Select to display the Select Link Template Key(s) dialog box.
You can use an existing object data field as the key column or create a new field. If you select Generate Key Field, specify a name for the field in the Generate Key area. AutoCAD Map 3D toolset sets the first record in the database table to 1, and increments each subsequent record by 1. Click OK to close the Select Link Template Key(s) dialog box.
The link template stores the address of the database table and the name of the key field. Accept the default or enter a new unique name.
You can select objects automatically or manually, and you can use a filter to restrict selection to specified layers.