Prepopulate a field in a Reference Dialog Box
Yes, you can.
What you need for this?
1) references_dialog
2) entityreference_prepopulate 
3) your custom_module.
For example field that you want to make with prepopulated field in url is entityreference.
Here is link to youtube how to use entityreference_prepopulate and URL https://www.youtube.com/watch?v=z9C4Uf6euLY.

After this you should override your "Create ..." link. How to do this?
Easy. Just implement hook_references_dialog_widgets_alter in your custom module and change name of function that generate add link

/**
 * Implements hook_references_dialog_widgets()
 */
function mymodule_references_dialog_widgets_alter(&amp;$widgets) {
  $widgets['entityreference_autocomplete']['operations']['add']['function']
    = 'mymodule_references_dialog_entityreference_add_link';
}


And than you can define your add link function: 

function mymodule_references_dialog_entityreference_add_link($element, $widget_settings, $field, $instance) {
// blah blah from original function
// Here you can catch field what you need and define url with $_GET parameters for it.
}


That's all. Enjoy reference dialog with get params in url.