This bar provides tools to transfer position, scale, shear and rotation data easily from one object to another. You simply have to select two nodes from the "Nodes" panel and/or the viewport and click on one of these buttons. The transformation data will be copied from the first selected object to the second one. As you can see, the order of selection plays an important role. The functions are not limited to objects of a particular type – properties can also be transferred from objects to emitters, for example.
Copy Transformations
Transfers all available node data to the target object.
Snap - Nearest side
Brings two nodes together as close as possible. This function calculates the nearest sides between two selected nodes and snaps them together. The first selected object is the reference and will not be repositioned when the second node is translated. This mode is especially useful for object dynamics – for example brick walls.