Change shape by block reference

[Trai]

Hi all, 

In my isometric drawing, I have many balloon. a shape balloon to show a note

for example

circle: Elbow

rectangular: Tee

end now I want to replace this shape  of balloon with click into an sample shape then sweept to choice block refence to replace.

You can see file that i attached and snapshot bellow

 Thank you in advane !

TEST.dwg

[BIGAL]

Easy if you use a dynamic block with multiple Visibility states.

 

Other way google replace block with new block. Multiple answers.