To reuse content from one subject to another the option is to Export then Import content into the new site.
It allows the transfer of material between course sites, organisations, or between organisations and courses.
Export Course/Organisation - creates a zip file of site content that can later be imported to a new site.
Import Package - the content of the zip file is imported into an existing site. into the same site or a different site.
Imported packages don't include student enrolments or dates.
Once you have imported the content into your new subject site, you might need to reorder and or un-hide the items on the navigation menu to suit.
Content appears in the order that you add it but it can be reordered.
Click on the downward arrow next to the content you want to hide
From the menu, select the option for Hide Link