How to duplicate process memory area into virtual memory?

Question

C++ / C#

There is a need to get the process memory for further use through RPM / WPM . You
cannot directly access the process through these 2 functions.
You must first allocate somewhere memory for virtual. Then, copy a part of the process memory there, perform manipulations with the copied part and replace the original memory with it.
DO NOT USE WPM/RPM FUNCTIONS TO THE TARGET PROCESS!!
Can you provide some code or links?