Doesent seem to work, the task group still appears under Fleet Command in the task force window
You need to form a new TG from the 4th tab of the TG screen (F12) using a node in the tree that's a child of the appropriate TF. The pulldown on the 1st tab does not work.
One other thing... The child nodes in the 4th tab are NOT TG (meaning a collection of ships that can be given orders in the 1st tab). You can form a TG from the contents of a child node, but the children themselves are not TG.
John