I'm trying to 're-use' text from a titleblock.attribute because I want to note down the old document number and the revision letter it had before re-issueing it at revision A.
Something in the line of these steps: 1) Read the Titleblock-text-Revision value > $OLDREV$ 2) Update the Titleblock-text-revision value with A 3) Update the Titleblock-text-dwgderivedfrom value with $FILENAME$ REV $OLDREV$
This is something I've been thinking about implementing for quite some time. It would definitely require several steps... 1) Call a lisp (in batch) to generate (& append to) a CSV (or other editable text file), with extracted attribute data. 2) Ability to sort/edit the file (Excel?) 3) Apply any changes back into the DWG files.
I've found this workaround using very nice code from lee-mac, and seems that it might suit your needs for the time being. I haven't had a chance to test this...