I want to use one virtual NIC to set two or more IP addresses (a primary IP, a secondary IP, and so forth). Can I do this?

You may be able to assign two or more IP addresses to one NIC on a virtual server if you use a fixed IP address (fixed IP) on a logical network to set two or more IP addresses to one port and set the added IP addresses on the OS. We are sorry for your inconvenience, but this function is not supported on virtual servers. The customers can implement it on their own responsibility.
Note that you can add the registrations of IP addresses as fixed IP addresses (fixed IP) but you cannot delete a specific IP address you have added. Be careful because you need to delete the port if you want to delete registered IP addresses.
*As shown in the service description about the restriction, one IP address should be assigned to one NIC in principle.