It is possible to edit the definition of multiple blocks in a project simultaneously. In the Project Window, simply select multiple blocks and selected ‘Edit definition’ for the ‘Block’ drop down menu.
When more than one block is selected then the ‘Edit definition’ tool becomes an ‘Edit several blocks’ tool that can be used to change the folder, prefix, extension or group for the block definitions.
If the current name matches the current data then it will also rename or move the files as applicable. Be sure to save the project after editing block definitions.