AutoCad Civil 3D 2011 --- Interpolate

To Create Points by Interpolation
1.Select settings and create styles, layers, point groups, and description keys.

2. Home tab  Create Ground Data panel  Points menu  Create Points - Interpolate -- Interpolate .

3.Specify the first point by doing one of the following:
•Pick a point in the drawing.
•Use Transparent commands to specify the point.

4.Specify the second point by doing one of the following:
•Pick a point in the drawing.
•Use Transparent commands to specify the point.

5.Enter the number of points to create

6.Enter a description, or press Enter to skip the description.

6.Result as below 

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