Even though, you can use the SELECTSIMILAR [found here] command to select a block and then this command will select the other blocks like the selected block…Here is a LISP rouinte that will make a selection set of a named block.
Edit the below lisp routine to select that you want selected. To do this, change the word “test” to the name of your block within quotes.
Save the lisp routine…
Thanks to Tharwat and him being extremely patient, he made many variations to this program.
The code in its various revisions can be found here: http://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/selection-set-by-block-name/m-p/5192827/highlight/true#M324878