title: How to discard independent set for CF in some YouTrack project and start using common set of values?
body: <p>As an administrator of YouTrack I need sometimes create and discard independent set of values of custom fields. Creation of independent set is trivial: just use appropriate button, but what if I want to discard existing independent set and use common set of custom field values? Is it possible to do it in some easy way (through UI, API or command)? </p>
  
  <p>For now, I have to add new custom field each time I need discard independent set. It happens not so often, fortunately. </p>