A structure constrains a process, a process entails a structure.
Structure is the relation among processes. Process is the ongoing dynamics over a structured manifold. Process leads to the alteration of structure, which in turn modifies the ongoing dynamics.
Creativity happens when the processes can intermix and intermingle in novel ways via the given structure; in ways not determined by the structure, but constrained and loosely organized by it.
So far as I can tell, one does not reduce to the other– they come as a pair.