Populating the z-value with a custom value
The z-values for features can be updated using a specified value. If you know the value that should be used as the z-values for your features, you can indicate it on the Populate Z dialog box and populate the features using the Populate Z for selected features tool.
- Start ArcMap.
- 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.
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Click the Production Start Editing button  on the Production Editing toolbar. on the Production Editing toolbar. Note: 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: 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. on the Manage Features window.
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Select the features whose z-values you want to populate using  the Edit tool  on the Production Editing toolbar. on the Production Editing toolbar.
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Click the Populate Z for selected features button  on the Production Z Management toolbar. on the Production Z Management toolbar.The Z Populate dialog box appears.  
- Choose the Populate Zs from value entered option.
- Type a value in the Populate Zs from value entered text box.
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Click OK. 
A message appears that indicates how many features were populated using the Populate Z For Selected Features tool. 
- Click OK.