Can i set up my in house accountant as an external accountant and then how do I gain access to the accountants toolbox? We have quickbooks desktop premier for contractors 2021.

I don't want to have to purchase another file as another person mentioned- I'd be fine Paying for the accountants toolbox though I imagine this is not an option. 

Besides that, what other benefits do I have setting up an in-house external user as external accountant? Is there any other way to get the accountants toolbox?