Sub account advice please!

Hello!

I'm new here and not very advanced with computers so apologies if I am asking a stupid question!

We have a small family business and up until now I have handled all admin, but I am now looking to employ an assistant receptionist. 

They would have to have access to the business emails so they can request prices from suppliers etc, but I don't want them to see all emails as there will be restricted information about other staff etc.

I don't want them to have their own complete account, however, as I need to monitor their emails (especially when they first start so I can help if there is anything they might not know how to handle).

My question is, is there a way to create a sub account for them, where I can see all emails coming and going, but they can't see everything?

Any advice would be greatly appreciated!