create CMS for wordpress theme

Question

I have converted HTML site to WordPress theme and uploaded it to the server, now i want to create CMS for this theme, but there are another active theme now and those are the the current pages .

how can I create a new page for my new converted theme without losing or effecting the current themes and the contents?

this the themes the active theme and my new covered theme

Answer 1

From what you describe I would advise you to create a Child Theme: https://developer.wordpress.org/themes/advanced-topics/child-themes/

Then you will be able to overrides only the templates you want if you conform to WordPress' Template Hierarchy: https://developer.wordpress.org/themes/basics/template-hierarchy/