Assign IP range in centOS 7 to network interface

Helllo to all, I'm very new to server administration, so I have a big question for me. What is the best way to assign a ip range to the network interface on the server? - I found some examples but I think there should be a better way round. In the most articles they're describing to add a config file for each ip address. I think this is not the best way. Maybe you have some suggestions. Examples: https://www.100tb.com/community/knowledgebase/display/HOW/Adding+Multiple+IP+Addresses+in+CentOS+7 The main ip to access the server is: 123.123.123.38 I have also the following ip adresses: 123.123.123.39 123.123.123.40 123.123.123.41 123.123.123.42 What is the best way to add them to the network manager?