Can we make regular page to child page by adding master page ?

I have a regular page name “test”.  I have a also mater page name “Test11”.  How to make “test” as a child page of “Test11”.
I tried to copy XML part from “Test 11” to “test”, it doesn’t work. Any suggestion ?

I think you need to create a new “test” page as a child of your test 11 master, then copy and past portions of xml from your original test into the new test.

Thank for the suggestion Raymond.