Method 1 (most common) Save layout to LIBRARY, and next time load the layout from the library, to be used on any post and any page.
On every Section, or Row or Module, there is a “Save-To-Library” button.
In this example, I will save this Section to the Divi Library. When this Section is saved to the library, the entire content (its row and module) within this Section will be saved as well.
We now can go to Divi Library (or, the Extra > Library) to see the layout we have saved there.
The saved layout is seen inside the library.
Back to the post, we click Add New Section.
We click, Add From Library.
Select the layout that we have saved.
Click “Use this section”
The new section, will be loaded from the library.