The new cli command is called address.
address [ new <label text with white spaces allowed> | all | <index_min>
[<index_max>] | label <index> <label text with white spaces allowed>]
To create a new sub-address for the current account use address new
.
You can view all addresses with the address all
command.
Each sub-address will get an index starting with 1 since the primary account address is at index 0.
You can also add a label to each sub-address as optional parameter or later with the label option.
Edit: If you want to see balance on the sub-addresses you can use the command "balance detail" on the cli.