Elias here with Shopify Support. Thanks for reaching out.
You can add your accounting manager as staff on your store by creating a staff account. There is a limit of staff accounts you can create depending on your plan. We have a handy guide here to help you manage staff accounts and another to help you understand the types of staff permissions. If you need help deciding on the correct permissions to give your accountant, we have one for accountant permissions.
Let me know if this helps! If you have any further questions regarding this topic, feel free to reply to this thread and I’d be happy to help.