You'll need to find a Pastel Calico Mojave het pied, and breed it to a Pied or het Pied. Piebald is a recessive gene, so you ned two copies of the same gene, one from each parent, to make it appear in offspring. From there, hopefully one baby will possess all 4 traits, but the odds are fairly slim. I know there are quadruple-gene pieds out there, but they are VERY few and far between.