Is it possible to sort existing subscribers into lists based on an attribute

For instance, is there a way for all subscribers with the same SIC code to be placed in a list together?

@PortiaMcGrath There isn’t a way to do that automatically. But if your intention is to send a campaign to only those subscribers with a particular SIC code then the Segment plugin will probably help. See

The plugin is distributed with phplist. You just need to enable it, and also Common Plugin, on the Manage Plugins page.