How to create import demo content like this ??
import demo content
Hello,
Creating a Demo Importer feature inside your theme can be done in multiple ways, depending if you already use a framework for your theme (for example Redux Framework) or a custom theme options page.
So, if you use Redux Framework or Option Tree (I see that you already use Option Tree) you can easily use this github repository (radium-one-click-demo-install). The results on your admin page will look like this:
It is compatible with Option Tree, so feel free to use it 
Good Luck 
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