The standard crossover cells in SigmaStudio supports two or three bands. Recently, a customer asked if a 4-band crossover could be implemented.
Currently, SigmaStudio does not support more than 3 bands on a crossover. However, you could always work around this limitation by cascading a 3-way crossover and a 2-way crossover. This workaround takes more instructions, but should get you the functionality you want.