Beanworks allows you to reassign invoices to organizational units in a group action.
Go to In-Progress under the Invoices module.
Select the invoices you would like to change by clicking the checkbox or by holding down the ctrl button while you select the rows with your mouse.
Select 'Actions' on the top right corner, then Change Org. Unit
Select the appropriate Org. Unit from the drop down, then select 'Change'.