Swapping Block Definition

Maybe I can’t see the trees for the forest here -

Is there a way to pick a block and simply swap it for a different one? I am trying to streamline a huge amount of window options (about ~2500 instances) and in setting up the system for how to do that, it would be very nice to pick one or multiples of the block, and have them changed to a different one.

Thanks.
BC

Use BlockEdit.
http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/blockedit.htm

or rather… ReplaceBlock.
http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/replaceblock.htm

Wim - excellent, thank you. Exactly what I was looking for.

On another note - all of these blocks are currently embedded inside the file (ie, not linked). It may become useful in the near future to start editing them as their own files and have them linked into the master file. Is there a way to make all instances of a file currently embedded inside the master-file changed to linked?