foxrever You can select that bone by right clicking. This is a common action in each view of Spine. For example, when you right-click an animation name in the Animations View, that animation is highlighted in the Tree View.

foxrever Unfortunately, it's not possible to select multiple bones with a single operation. However, I noticed something I overlooked in your original question. You want to bind the bones that are bound to a mesh attachment to a bounding box attachment, correct? If so, you can use the copy and paste function in the bones list of the weight view. This has been possible since version 4.2:

I hope this helps.