I am not sure the following is easily doable or doable at with Toolset.
I have on the site 2 post(types) 1 is Topic and the other Article. The content is absolutely the same just once it is used in a "course" and the other time in a knowledge base.
I would need some solution where I only have to edit in on one location.
So let us say. I have "What is WordPress?" (Post Type Topic) and "What is WordPress?" (Post Type Article) if I make changes to the topic I would like the content changes for the article with same name as well.
Is there any documentation that you are following?
Actually this something that you're not able to achieve with our Toolset plugins so a 3rd party solution will be required.
What I recommend that you do is to contact one of the registered contractors on our site for a custom solution for this . https://toolset.com/contractors/