Find And Replace Group Of Blocks That Are Selected

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There are plenty out there and AutoCAD 2013 and lower has a Find and Replace Blocks.  However, the frustrating catch is I can seem to find a routine that will allow me to replace only those blocks that I select with a selection set of my choosing.  The built in function replaces all of them and will not let you exclude some.  We have PID drawings that we want to replace valves on, but not all valves.  We don't want to rename.  We don't need to BEDIT the existing block. 

 1) Pick group of blocks

 2) specify a new block that will replace all instances of old block

 3) replace inserted block with different block.  Leaving others alone.




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