In the past one could follow these instructions to expand a group in your address book to select only some members of the group. This answer is from "sfhowes" in 2016. "Here's a way that doesn't depend on add-ons: in the Write window, press F9 to show the Contacts sidebar, then select an address book at the top of the sidebar that contains mailing lists (or use All Address Books). Right-click a mailing list, Properties (Alt-Enter), click OK to display the list in the sidebar, then select the desired contacts while holding Shift or Ctrl, then click an Add to... button at the bottom of the sidebar." This no longer works. Nothing happens when you (or a least when I) click OK. Is it still possible to in some way expand an address group? I know you can start in the address book but that does not offer the option for selecting recipients for the CC or BCC fields.