I currently have many (20+) custom fields per post running on my website. However, as it stands I need to go down to custom fields on every post and either select which custom field name I want from the drop down menu or write it in from scratch then input the value and click the add custom field button. This is extremely time consuming and would be much easier if I could simply build some sort of UI that had the repetitive information pre-filled where I could just input the values (which are unique for every post) rather than write everything out every time. I'm not looking for a plugin but rather an explanation or a link to a tutorial on how to do this. Any help would greatly be appreciated.