Populating the z-value with a surface
The z-values for features can be populated using a raster file to interpolate the appropriate values. The Populate Z For Selected Features tool allows you to specify the raster file from which you want to interpret the z-values.
Note:3D Analyst must be installed to populate z-values using a surface.
- Start ArcMap.
 - Verify that 3D Analyst is installed and the extension is enabled.
 - If necessary, load data in the map.
 - On the main menu, click Customize > Toolbars > Production Editing.
 - On the main menu, click Customize > Toolbars > Production Z Management.
 - 
Click the Production Start Editing button 
 on the Production Editing toolbar.
Note:The Manage Features and Create Attributes, Update Attributes, or Metadata Attributes windows automatically appear when you start an edit session using the Production Start Editing tool.
Tip:If the Create Attributes, Update Attributes, or Metadata Attributes window does not appear when you start an edit session, click the Show/Hide Attributes button
 on the Manage Features window. - 
Select the features whose z-values you want to populate using  the Edit tool 
 on the Production Editing toolbar. 
 - 
Click the Populate Z For Selected Feature(s) button 
 on the Production Z Management toolbar. 
The Z Populate dialog box appears.
 - 
Choose the Populate Zs from surface option. 

 - 
Do one of the following to choose a raster to use for z-value population: 
To use a raster that is currently loaded in the map
Click the Populate Zs from surface drop-down arrow and choose the raster to use.
To use a raster that is not loaded in the map
Click the Populate Zs from surface drop-down arrow and choose Browse. Navigate to the raster you want to use in the Select Surface dialog box, then click Add.
 - 
Click OK. 
A message appears that indicates how many features were populated using the Populate Z For Selected Features tool.
 - 
Click OK.
Tip:You can view the updated z-value in the Sketch Properties window.