If you need to pair the levels of a categorical factor to those of other categorical or discrete numerical factors in your design, then read the following tutorials to learn why and when you might need to do this, and how to achieve this in Synthace.
Learn what derived categorical factors are and when they might be used.
Learn how to derive the levels of one categorical factor from the levels of another categorical factor.
Learn how to derive the levels of a categorical factor from the levels of a numerical factor.