Final answer:
To print a customized sales invoice, you do not need to customize the sales journal window.
Step-by-step explanation:
To print a customized sales invoice, you do not need to customize the sales journal window. The sales journal window is not directly related to printing sales invoices. Instead, you need to follow the steps of selecting 'custom Simply form' as the form type, selecting 'user-defined form' as the description, and clicking customize to select the columns and fields you want to use.