How to store objects of type Process and arrays in the same collection?

Question

C++ / C#

When I get all processes using the GetProcesses() method, I see that some processes have the same name. And I need to store single processes and arrays of processes with the same names in the collection. That is, like this:

{SearchUI, DevEnv, Explorer, [svchost, svchost, svchost, svchost], [firefox, firefox, firefox, firefox, firefox}, ]

These arrays are needed to find out the ID of each process separately