update the 2nd titleblock with the data from the 1st..

This should do it...

;------------------------------------------------------------------------------
;MATCH_ATTS: From user selection, pick block with atts and all matching
; tags from target block will match its atts to the source
;Dependencies: ATT_READ
; ATT_UPD
;No error handling!
;------------------------------------------------------------------------------
(defun C:MATCH_ATTS (/ SRC_BLK TRGT_BLK)
(setq SRC_BLK (entsel "\nSelect Source Block.&quot)
(princ "\n&quot
(setq TRGT_BLK (entsel "\nSelect Target Block.&quot)
(setq ATT_LIST (ATT_READ (car SRC_BLK))
TRGT_ENT (car TRGT_BLK))
(setq SUCCESS (ATT_UPD TRGT_ENT ATT_LIST))
(princ)
)
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
; ATT_READ: given an eref to a block, return a dotted pair list of attr. tag
; names and attr. values.
;
; - syntax: (att_read <eref>) -> ((<att tag>.<att data>) (etc.)...)
;
; - no library dependencies
; - returns nil if an error condition is detected.
;------------------------------------------------------------------------------
(defun ATT_READ (EREF / ENT_DATA ATT_LIST)
(setq ENT_DATA (entget EREF)) ; passing a nil eref parameter will cause a crash
(cond
((/= &quot;INSERT&quot; (cdr (assoc 0 ENT_DATA))) NIL) ;not a block
((= NIL (entnext EREF)) NIL) ;no entities following
((/= 1 (cdr (assoc 66 ENT_DATA))) NIL) ;no attributes following
(t
(while ; step through all the attributes
(= &quot;ATTRIB&quot;
(cdr (assoc 0 (setq ENT_DATA (entget (entnext (cdr (assoc -1 ENT_DATA)))))))
)
(setq
ATT_LIST
(cons
(cons
(cdr (assoc 2 ENT_DATA)) ; att tag
(cdr (assoc 1 ENT_DATA)) ; att data
)
ATT_LIST
)
)
)
ATT_LIST ; return value
)
)
)
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
; ATT_UPD: Update the attributes of a block given by the eref according to the
; information in the <att_list>.
;
; - syntax: (att_upd <eref> <att_list>) -> T/nil
; - returns nil if an error is detected, T otherwise
; - <att_list> is a list with format: ( (<att tag>.<att data>) (etc.)...)
;
; Note: no error occurs if the block's attributes don't match those in the
; <att_list>. Data is transferred between all matching attribute
; tag names - if there's a mismatch the program doesn't mind at all,
; but no data transfer will occur for that particular item.
;
; - no library dependencies
;------------------------------------------------------------------------------
(defun ATT_UPD (BLOCK_REF ATT_LST / ENT_DATA)
; if the block_ref parameter is not an eref to a block insertion, the
; program will crash
(cond
((= NIL (entnext BLOCK_REF)) NIL) ;no entities following
((/= 1 (cdr (assoc 66 (setq ENT_DATA (entget BLOCK_REF))))) NIL) ; no attributes
(t
(while ; cycle through all attributes...
(= &quot;ATTRIB&quot;
(cdr (assoc 0 (setq ENT_DATA (entget (entnext (cdr (assoc -1 ENT_DATA)))))))
)
(setq ATT_TAG (cdr (assoc 2 ENT_DATA)))
(cond
((setq NEW_ATT (assoc ATT_TAG ATT_LST)) ;mismatch filtering...
(entmod
(subst
(cons 1 (cdr NEW_ATT))
(assoc 1 ENT_DATA)
ENT_DATA
)
)
)
)
)
(entupd BLOCK_REF) ; regen the block
t
)
)
)
;------------------------------------------------------------------------------
(princ)
(princ &quot;\nType Match_Atts to begin&quot

&quot;Whether you think that you can, or that you can't, you are usually right &quot;
.. Henry Ford

This is what I was looking for only I cant get the command to work.
This is what i get:

Command: MATCH_ATTS
Select Source Block.

Select Target Block.
no function definition: ATT_READ

Any suggestions as to what is wrong. Please help.

Make sure that the entire 3 functions (defuns) are included in the one lisp file.

BU

&quot;Whether you think that you can, or that you can't, you are usually right &quot;
.. Henry Ford