Intranet URL should be "https://Intranet.ClinetName.com" in SharePoint 2013 Online (Office 365 E3 version)

Hi,

Our client is looking URL should be below one in SharePoint 2013 Online (Office 365 E3 version).

For Library URL should be: https://Library.ClinetName.com

For Intranet: https://Intranet.ClinetName.com

Any information,approach about this would be greatly appreciated. Thanks!