Yes, to an extent. Only you, the reseller has access to the over-arching Reseller panel which allows you to control and manage all of your cPanel accounts. You then have control over what features each individual cPanel account has access to, either individually, or through packages. So if you want to restrict access to certain features in the cPanel, you can do this or if you want to give your clients access to every feature in cPanel, you can also do this.