Thank you so much for using our theme Corporate Plus Pro. While creating portfolio section as our demo, you need to follow the following things clearly.
1. Title of the Subpages(Set to a parent page) appear as title
2. Excerpt content will appear as subtitle
3. Featured image on that subpages.
Follow this method for your help. You can make the other section similar with this method.
If you need any help, you can follow the documentation or blog post here.
If your problem is not solved, let us know.