When you select a wave, you select from sales orders, customer scheduled orders, or distribution orders. Within wave planning, the order types are not distinguished. Wave planning creates the picking and replenishment tasks associated with the orders in the wave.

You can define wave options so that the maximum number of order lines can be set for a single wave. You can also set other options that let you create a wave based on order type, due date, weight, priority, carrier, route, and so forth.

See here.

You can also use a wave utility program to change the order priority of the wave, as needed.

See here.