Is there a way to have a custom admin section function like the built-in admin section? 

For example, optimizely has the built in "Tools" tab and within that, there is a list of tools that can be clicked on and interacted with. I would like to make a "Custom Tools" section and have a list of custom tools that works and looks like the built-in one. 

I know how to create the "Custom Tools" tab but I want to know if there is a way to get the look and feel of the content of the built in-tab inside my custom tab without having to rebuild that functionality in react. We have about 20 different tools so just adding them as tabs under the main navigation would be too messy.