Change Matrix block trough entries

Is it posiblle to add option change Matrix block trough entries. I copy them from entry to entry with Smith plugin, so think there must way to change/replace them :)
In way Bulk Edit works..
I'm not sure I'm following the feature request. Could you try to explain another way for me, preferably with step-by-step examples of how you see it working?
I have 1 matrix field with couple blocks.. kind of page builder.

I have Pages and page elements of web site in entries..

Each entry have.. for example HEADER::.element

Now if i make some change Header element, i want to replace that Matrix block or Header element in all entries.. with that change Or Copy paste but in bulk..
Now i go entry by entry and copy paste with Smith plugin. .
I want to update or replace just that 1 block in matrix..
now that allmost work..now.. but all other blocks get deleted..
Ahh, I see. You're really looking for something more like reusable matrix blocks, similar to this feature request: craftcms/cms#4769
I'm not sure this fits well into the scope of the plugin, I think this may be architected better in your content model. For example, you could create a channel for these blocks and have an entry type called "Headers" that you then link a common header to within your entries.
Let me know what you think!
just another screen.. :)

Now when i replace header.. in all entries.. all other block get deleted..
Or.. all works OK:: if other blocks that are not on replace page are not deleted....
I want to replace just block inside matrix..