ATM, the only way I can think of, it’s to configure the second connection following standard centos instructions.
Adding support for multiple pppoe connections to nethserver seems tricky.
You could use the web gui to add the first connection, then copy relevant files and add the second connection.
cp /etc/sysconfig/network-scripts/ifcfg-ppp0 /etc/sysconfig/network-scripts/ifcfg-ppp1
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