Moving trunks between groups

Select the trunk you want to move, from the list of trunks in the right-hand window, in order to highlight it. Then, using your left mouse button, drag it across to the trunk group window on the left, and position it over the trunk group you'd like to move it into. When the destination trunk is highlighted, release your left mouse button and the extension will drop into this group.

You can verify that the trunk was moved successfully, by selecting the destination group in the left-hand window, and locating the trunk in question in the window on the right.