Gathering brings in the raw goods. Refining makes the common materials from them, and refining a common one again with an additive makes the uncommon ones. Production takes them from there.
Common wood, refined from Pine Wood by Milling at level 1 (recipe).
One Pine Timber takes 3 Pine Wood and 1 Creosote.
Uncommon versions: Crimson Pine Timber and Grey Pine Timber
Refined further into:
Production takes it, or its forms, in 260 Carpentry, 4 Blacksmithing, and 4 Tailoring recipes.
What it adds to gear parts made from it: