Transform linked images to embedded images

I found the solution here, the keyword was "unlinking images".

Here is the procedure for Word 2007.

1. Press Ctrl+A to select the entire document.
2. Click the large Microsoft Office button in the top left corner, select Prepare, then click Edit Links to Files (or press Alt+E+K).
   All links should be selected—if they're not, then make sure you've saved the document as a *.doc file, OR select all the files listed by scrolling to the end of the list and then using Shift+click to select the last in the range.
3. Select the Save picture in Document check box.
4. Click OK.

In Word 2010:

Click File > Info > Edit Links To Files (Edit Links is in the Related Documents section on the bottom right). This opens the Links dialog.

Select all the links in Links dialog, and then click Break Link.

Note: Edit Links To Files only shows once a document has been saved to disk, and when the document contains links to other files.

I use LibreOffice and there is a function Edit/Links/Break link.

But I looked in MSO (I have here only 2010 Starter, which use only occasionally) and if you right click on image and choose Remove hyperlink, it seems to work in the same way.