In order to create a wave for the sales order,
- First create sales order
- Create a wave – Go to Transactions > Order Management > Create Wave
- Select the sales order location and click Search.

- All the sales orders in the corresponding location will list in the page.
- Select the created sales order from the list
- Save the Wave after selecting the sales orders for picking.
- On saving the Wave, the wave will be created for corresponding Sales orders.