Disk Expert lets you collect files into a special list to further managing them. To add files to this collection you can drop items right from the diagram or select files in the list of Biggest files.
You can manage the selected items by moving, copying or removing them.
If you click to remove selected items, they will be physically moved to Trash. You can copy the items, listed in the collection to any desired folder. The command Move to Folder allows you to move the selected files to the desired folder physically.
Also, you can use the Menu Bar to operate selected items.