Automatically Retrieve custom field value

Hi, I need some helps.

I wondering is there any way to retrieve custom value from certain post and use it in a new post?

Let me explain the situation. Let say i made a post “Original” and add 5 custom value in this post. The custom value is use for displaying a specified footnote in that end of the content (it could be combination of links ,thumbnails, and foot note).

When I made another new post “Second” where I want the same footnote as in the post “Original”. One simple way is just copy all the custom value from “Original”.

But I dun want to do this because it is too much work. Imagine that if i made 10 posts that need the same footnote, I ll have to repeat to copy again and again.

So I need a approach where when i made a new post, i only need to set a new custom field, and it will directly retrieve the value in “Original” post.

Is there any approach to doing this? What is the code is to retrieve selected custom value? Or it has related plugin to doing this?

You are also feel free to tell me other approach to realize the situation above. I have been struggled 2 days looking for this answer.

Thank you !