You can copy your references in bulk by selecting the checkboxes of the references you need (if you're inside a project you can use the master checkbox to select all references in that project, or if you're in the All references section you can select all of your references in bulk if needed). Then simply drag and drop the references into a project to copy them over. If you want to move them as opposed to copying them, select the references as described above, then click the copy/move export icon:
And choose the Move to... option then select your desired project.