I have tried to insert pages from one file to the other. The pages I am interested in inserting are already edited but when I drag them over to the second file they are overlayed with the Master design which then covers up all my editing and the writing on the page.
How do I prevent this from happening.
Rename the master page applied in one or the other file. When you move things from one file to another anything defined with the same name -- master pages, styles, swatches, will take on the definition of the destination file.