Reflection: How to get the class object via PropertyInfo

I have 2 classes. ClassA has some objects of ClassB called Field01, Field02, ... Class A also has a list of ClassB items.

I know the name of the ClassB items and want to fill the ClassB items with the values from the list.

Example code:

public class ClassA
{
    public ClassB Field01 {get;set;}
    public ClassB Field02 {get;set;}
    //...

    List<ClassB> myItems;

    public void FillItems()
    {
        foreach(var item in MyItems)
        {
           // what I want in hardcode:
           Field01.ValueA = MyItems[0].ValueA;
           Field01.ValueB = MyItems[0].ValueB;
           Field02.ValueA = MyItems[1].ValueA;
           // ...
        }
    }
}

public class ClassB 
{
    public string ValueA {get;set;}
    public string ValueB {get;set;}
}

In my case I'll have a counting variable which will create the Field01, Field02, Field03, ... names depending on how many items are in my List (there are always enough ClassB fields in ClassA to fill)

I know i can get the PropertyInfo of my ClassB items via name, but I don't know you I can access the ClassB attributes ValueA and ValueB

// If ClassB was just a string or object this would work
Type myType = typeof(ClassA);
PropertyInfo myPropInfo = myType.GetProperty("Field01");
myPropInfo.SetValue(this, "Hello", null);