How to add custom menu in admin panel?
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First, Open the Admin panel. Go on the top of the option. Click on this there are a lots of option.
You need to select the custom option. And this option add in the pages then you can create the Custom field.
If you want to use easy option, Go to the plugin and Install Advanced custom field. After activate the plugin.
Option will create in the admin panel. And use the plugin according to the Documentation.