The switches with Sc0 you are talking about the supervisor (which runs separately from the MSFC) and needed a management address. So Sc0 is configured to meet this need. With your new switch running IOS both the supervisor function and the MSFC function run in a single entity. You will use interface vty for management of the native mode switch.
As Ric said SC0 is the management interface and the address you would telnet to . The address you would use can be any routable address that is configured on the 720 and you would just telnet or ssh to that address whether an interface , SVI or a loopback interface .
For me, the simplest way to add a management IP would be creating a VLAN interface and giving it an IP on the VLAN subnet. In essence, that is the same thing on CATOS. You have to put SC0 into the correct VLAN. This is assuming you are not routing. If you are routing, there are multiple options.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...