How to create a web app from an existing web page within ChromeOS

To create a web app within ChromeOS from an existing web page, access the URL in question as normal.  Click on the three button overflow menu selection –> More Tools –> Add to shelf.

A small dialog box should appear.  You can rename the entry and also use the available option to open the shortcut within a new window.

A new shortcut icon should appear on the taskbar.

To remove the “Open as window” option, right-click on the taskbar icon and uncheck the menu selection.