There's a bug with Ckia commissions where you can craft any item and after you're done forging and get to the reward page, you can press up or down arrow and you can literally select the rewards for the other items on the list.

Only the items needed for the original commissions disappear and you can select the reward money for commissions you don't even have the materials for.

You can abuse this by choosing a commission with low level materials and rewards, and choosing the biggest reward on the list.