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Creating a Pressure Network in Civil 3D involves several steps, from defining the network to laying out pipes, fittings, and appurtenances. Here's a complete guide:

Steps to Create a Complete Pressure Network in Civil 3D
1. Set Up the Drawing
Check Units and Scales:
Go to Toolspace → Settings tab.
Right-click on your drawing and select Edit Drawing Settings.
Verify the units, scales, and coordinate system.
Load the Pressure Network Catalog:
Ensure the correct pressure parts catalog is loaded (see previous answer for guidance).
2. Define the Pressure Network
Access the Pressure Network Creation Tool:
Go to the "Home" tab → "Create Design" panel.
Select "Pressure Network Creation Tools".
Create a New Network:
In the Pressure Network Creation dialog, set the following:
Name: Give your network a name (e.g., "Water Distribution").
Parts List: Choose an appropriate parts list (e.g., PVC pipes, steel pipes).
Surface: Select the surface for pipe elevations (optional but recommended).
Alignment: If your pressure network follows an alignment, select it here.
Click OK.
3. Lay Out the Pressure Network
Choose Layout Tools:
Once the network is created, the Pressure Network Layout Tools toolbar appears.
Select tools to lay out pipes, fittings, and appurtenances:
Draw Pipes: Lay out pipes in plan view by clicking points or snapping to objects.
Add Fittings: Place bends, tees, and reducers at appropriate locations.
Add Appurtenances: Insert valves, hydrants, or other accessories.
Set Elevations:
Use the "Set Pipe Elevations" tool to assign elevations relative to the surface or manually.
4. Adjust Network Properties
Modify Parts:
Use the Pressure Network Panorama (appears during layout) or select network parts directly.
Right-click and choose "Edit Pressure Network Parts" to adjust sizes, materials, or other properties.
Edit Geometry:
Use grips to adjust pipe lengths, positions, or angles.
Add or remove parts as necessary.
5. Annotate the Pressure Network
Add Labels:
Go to the Annotate tab → Add Labels panel.
Choose Pressure Network Labels and apply them to pipes, fittings, or the entire network.
Profile View (Optional):
Create a profile view of the pressure network for visualization.
Use "Draw Parts in Profile" to show pipes, fittings, and appurtenances along an alignment.
6. Finalize and Validate
Check Design:
Review the network using the Pressure Network Panorama for consistency and accuracy.
Adjust any components or elevations as necessary.
Export or Share:
Save the drawing and optionally export to other formats (e.g., LandXML).
By following these steps, you'll have a complete pressure network ready for analysis, annotation, and documentation. If you need help with any specific step, let me know!