Modify some instances of a block leaving the rest as they were.

I would like to change the geometry of some instances of a block based on the attribute values. For example: All the instances are right now circles with text in them. I want to chance the circles to hexagons if the text was C10, C11, C12. And change the circles to squares if the text was D10, D11, D12. Is there possibly a way to do this?
Was wondering if I can filter the blocks depending on the attribute values, rename those blocks and then substitute them. Do you have any suggestion?

 

yeh its is possible to do this but the easer way will to create a lisp routine to perform this task for faster performance if u needed it just reply me

 

Yes I do need it!!!! That would be awesome. Thanks a bunch.

 

Meenankshi,
I think you would need (3) blocks to accomplish this.
One with a Circle (existing), One with a Hex, built
the same as the Circle, and One with a Square, built
same as the Circle..e.g. same insertion point.
Then, with a lisp program, pick the Circle(s), replace with
either a Hex or Square block, with the save value of attribute.
What is needed is a Lisp that allows selection of the Circle(s),
and a routine that gets the attribute value, and erases the Circle block, and inserts the Hex or Square, in the same spot,
with the attribute filled in.
If you want, I can provide the routine.

Bob

 

That would be great if you can provide the routine. Thank you. I really appreciate your help.

 

tried my lisp had it showed any problems...