how change Gravity System part List In Civil 3d

To *change the Gravity System part list* in Civil 3D, follow these steps:
1. *Access the Pipe Network*
Open the drawing in Civil 3D that contains the pipe network you want to modify.
On the *"Prospector"* tab (usually on the left side), expand the *"Pipe Networks"* node and locate the specific pipe network you want to modify.
2. *Select the Pipe Network*
Right-click on the pipe network name and choose *"Edit Network"* from the context menu.
This opens the **Pipe Network Vista**, where you can make changes to the network.
3. *Change the Parts List for the Pipe Network*
With the pipe network selected, go to the *"Modify"* tab on the ribbon.
In the *"Design"* panel, click *"Pipe Network"* and choose **"Edit Parts List"**.
This will bring up a dialog that shows the current parts list assigned to the network.
4. *Select a New Parts List*
In the *"Network Properties"* dialog box, find the *"Parts List"* field.
Use the drop-down menu to select a different *gravity system parts list* that you have created or modify an existing one.
5. *Adjust Pipes and Structures (if necessary)*
Once you've changed the parts list, you may need to update or replace the pipes and structures in your pipe network to match the specifications of the new parts list.
You can do this by selecting individual pipes or structures in the drawing, right-clicking, and choosing **"Swap Part"**. This allows you to choose parts from the new list.
6. *Update Network*
After making all necessary changes, click *"OK"* to save the new parts list for the pipe network.
If needed, rebuild the network by selecting *"Rebuild Network"* from the *Pipe Network* ribbon.
By following these steps, you'll successfully change the parts list for your gravity system in Civil 3D.