In Auotcad map 2009 we are using import  facility of dgn to dwg then loading of dgn 3dpolyline in autocad then only elevation is display but in microstation there is a different z value like 1.32,1.29,2.00 so in autocad only elevation is displayed, does not show all z vaule in some element .

Bentley havent all solutions for atributs into geometry.
XYZ in Auto CAD was atrubuts attach onto geometry, thats automatical design.
So, if you'd like to take out all points ( with xyz ) from MSBentley, best way is make a import dgn, and read atributes ( xyz ) like text into coordinates.
Query tehnic:


Using numerical text values with a text object at zero elevation to create a surface
Publish date: Apr-12-2006

Applies to:
AutoCAD Civil 3D 2005
AutoCAD Civil 3D 2006
AutoCAD Civil 3D 2009
 
Issue
 
You placed AutoCAD text objects in a drawing. These objects are numbers that represent elevations. For example, an AutoCAD text object has a value of 256.4, but the properties of the text object show a Position Z value of zero. You want to move each text object to the elevation provided by its text value in order to create a surface.
 
Technical Solutions
 
To move each text object to its text value elevation, follow these steps:
 
Note: In the original drawing, make sure that the text is alone on one layer. You should also make a note of the layer name.
 
To attach the drawing

Open a New drawing
On the Map menu, click Drawings > Define/Modify Drawing Set.
In the Define/Modify Drawing Set dialog box, click Attach.
In the Attach dialog box, browse to the drawing with the text.
Click Add.
Click OK to close each dialog box.
To define a query

On the Map menu, click Query > Define Query.
Click Property.
Select the Layer option (you choose the layer to use).
Click Values.
Select the layer containing the text.
Click OK to close each dialog box.
Click Property.









Select the Object Type option (you choose all text on that layer).
Click Values.
Select the Text.
Click OK to close each dialog box.
In the Query Mode area, select the Draw option.
In the Options area, select the Alter Properties option.
In the Select Property area, select the Elevation option.
Click Expression.
Expand the Properties folder and select STRING, and then click OK.
Click Add, and then click OK.
Execute the Query

Click Execute Query.
Click OK .
Zoom Extents.
Each text object in the drawing now has the physical z value equal to the text value. For example, a text object seen as 254.6 has a Z (height) property of 254.6.
Create a surface from text objects

Create a surface with a name.
Expand the Definition category.
Right-click on Drawing Objects. Click Add.
On the Object Type drop-down menu, select Text.
Select all the text in the drawing.
 

We at Dimension India(www.dimensionicad.com) use the following method to import dgn to dwg in Autocad:To
optimize the data transfer from the MicroStation® DGN file format, the creator of the MicroStation drawings should consider the following recommendations:

Create a separate DGN file for each design
model
Do not reference sheet models from design
models
Minimize the use of custom objects and
other data unique to MicroStation
Use ByLevel for color, line style, and
weight properties
Use simple line styles as much as possible
Use simple patterns and pattern styles
Use TrueType text fonts rather than SHX
text fonts
Use defined styles for dimensions and
text rather than a “none” style
Use simple dimension styles if possible
Use shared cells as opposed to normal
(library) cells
Work primarily in one format, DWG or
DGN, rather than switching back and forth

When
importing a DGN file, specify the conversion units (master units
or sub-units) based on the DWG file's drawing units. For example,
if you receive a DGN file with master units set to meters, and sub-units
set to millimeters, and you need the drawing units of the DWG file
to be in meters, then select master units in the Import DGN Settings
dialog box. This matches the meters in the DGN file to the meters
in the DWG file. I hope this will help u as well.Thanks!!
Rajashree2010-04-29 11:47:48