I am using catia v5
suppose I have created a assembly and inserted a part to it
then I inserted the same part again either by multi-instantiation or copy paste whatever
then both the parts are linked to each other, if I make some modification to one it reflects in the other
so how do I break the link between both the parts
I know one option is paste special with break link, but how to break the link of already existing parts
there is a few solution for this problem. you can copy your file in your folder and give it a new name (dublicate the original file). then insert it to the assebly. now made your modification.
you can open it file--new from. this also create a new file from existing one.
you can use break link as you said and you can change it with replace command.