If you have your 'Snap Points' turned on and set to 'Half', then when you touch an edge of the beam in section you will get a half snap point.
Now you can drag from there to where ever you want.
You could also use the 'Align' tool (Special align - centre note with draw line arc).
But I don't think this is as good as it is not really intended to be used in this situation.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11