How can we have Active Directory account same privileges as Viadmin user


We are using version 8.0 and we have a requirement where in we don't want to use system user credentials to log in to the tools and instead we want to use Active Directory account credentials. In order to achieve this, we need to have viadmin privileges assigned to Active Directory account. I tried creating custom permission group from QBM_BaseRight permission group and assigned this permission group to the user but it did not work. How can we achieve this?