Two Layers of hierarchy with polymorphism resaults in memory leakage

I assume you already know this, but I have to make sure:
The two lines of code you posted are a memory allocation. The memory will be used until you release it with a call to delete:

delete personel;

This is C++ after all - as I said I assume you already know this.

The second catch is the destructor declaration - if you want to use a base class pointer to reference objects it's important to keep the destructors virtual:

virtual ~CPersonel()

otherwise the call to delete the object made via a base class pointer will not cause the derived class destructor to be called. Sometimes this is hard to spot, but if you make any allocations in the derived class constructor - there's your leek.

The information provided is insufficient to help you. But the guess is you aren't removing all of the memory allocations that were made in the constructor in the destructor. You better take a closer look at these two functions of all the classes in the hierarchy. If things are proper there, it might be that in the life span of these class objects, some operations might have allocated memory which are not deallocated.