uploading selected (new php version) pages inplace of existing html pages

[Tracy]

Hope I ask this so that you understand. 2 questions.
If I have 20 HTML pages that are linked from my navigation menu but I only want to change 5 of them to php for the clients editing purpose with CMSms and leave the rest as is, can I do this? So far I have only been able to see my index.php after I delete the index.html. I tried the same thing with another page thinking all I had to do was build this page with CMS and then delete the html version but it is not showing up. I feel like I am not getting anywhere with the uploading of the php pages.

[Dr.CSS]

Build your cmsms site with the pages you need, for them to edit, then in the menu make the links to .html pages...

Make links...

Content > Pages > Add New Content in the Content Type: Link then fill in URL path...

Once you have this you can render a page view the source and copy the menu ul li and paste it into the .html pages...