Well, one way is to use the "Read More" facility.
Write your overview and follow it with the full body of your article and simply insert your Read More link which hides that main body of text.
In the "Post Content" tool bars, it's the !M button.

John wrote:

Well, one way is to use the "Read More" facility.
Write your overview and follow it with the full body of your article and simply insert your Read More link which hides that main body of text.
In the "Post Content" tool bars, it's the !M button.

Wow. It's very simple and works perfectly. Thanx for answer.