Copy object data fields into subclass instance

Question

I have two class, TNode and TMaster. I subclassing TMaster from TNode.

The goal is to create a TMaster instance that contains all the data of a previously created TNode

Answer 1

It should be done manually.

Probably you want to implement something like Assign for TPersistent descendants. To make it work, you have to override Assign(To) routine, implementing deep field-by-field copying.