Publish content to subsite from main site

Hi !

How are you ?

I have a question due to a client need... My client has a multisite with that structure :

- The main site for all the visitors,
- One "Pro" subsite, for professionals

What he wants is to create pages and custom post types from the main site only and choose if it is a content for the main site or the pro subsite. He doesn't want to switch between 2 admins and he also wants to create a site for the main site and duplicate it for the pro subsite. The 2 themes are different.

Do you have any ideas to achieve that ?

Thanks a lot !