How to pin a control panel item to start?

First we need to create a short-cut to Network Connections.

1. Right click on an empty area on the desktop, and click on New and Shortcut.
2. Copy rundll32.exe shell32.dll,Control_RunDLL ncpa.cpl into the location area and click Next.
3. Name it Network Connections. and click Finish.

That will do it, but you can change the icon to a network icon by the following:

1. Right click and select properties of the Network Connections shortcut and select Change Icon.
2. Copy "%SystemRoot%\System32\netshell.dll" for the path to "Look for icons in this file."
3. Select your icon.

Source

Now you just need to right click and pin your shortcut to Start.

I know this has been already solved but, there is a much easier way to achieve this.
You can create a Shortcut to Network Connections by typing control ncpa.cpl in location field in New Shortcut Creation Wizard and you are done.

Syntax is control <any item from list>.cpl.
This syntax can be used with Run to access a lot control panel items easily.

PS: C:\Windows\System32\control.exe ncpa.cpl can also be used as location.

Currently, there isn't a way to "pin" various Control Panel items onto the Start screen.

The best that you can do is view "Administrative tools" (Win + C --> Settings --> Tiles --> Show Administrative Tools) which contains a few more applications within the Start screen, but not specific areas of Control Panel.

What control panel you want to pin?
there are two the main control panels.
non classic the \All Control Panel Items is classic..
You can send shortcut of C:\Windows\System32\control.exe to the desktop, then pin it to the start menu that gives you non classic..
For the classic control panel from the desktop shortcut open control panel click the > a drop down menu will appear, select the top All Control Panel Items.
Drag the All Control Panel Items icon to desktop than pin All Control Panel Items to the start menu.
hope that helps.