How to Expand an Existing Structure Array?

As a simple example, I create the struct B with one field:

B.D = 1;

How do I set parent struct A for the above-mentioned struct B?

A.B.D

How do I set a field between B and D?

B.C.D

Answer 1

[Walter Roberson]

"How do I set parent struct A for the above-mentioned struct B?"

A.B = B;

"How do I set a field between B and D?"

temp = B.D;
B = rmfield(B, 'D');
B.C.D = temp;