Unfortunatly its not possible to create something like a "permission Admin system" within the Community Edtiotion - If you want to use this straight from magento you have to upgrate to EE.
Since i have faced this issue on my own project i did some research and found the following extensions:
https://amasty.com/advanced-permissions-for-magento-2.html
Maybe its worth a look and check the functionality.
