Depending on your settings, OfficeRnD can send the monthly invoices either only to the Company's email address or to both Company and its Billing Person. Should you need to send these invoices to another member, you can mark them as a Billing Person as well.
What you need
Please make sure you have activated the appropriate option from Settings/Billing:
How to Add a Billing Person
Any member of a company can be marked as a Billing Person. Please take a look at Contact Person & Billing Person Permissions where we cover all the details around this status' functionality and permissions.