It would be helpful if we can copy a block from one IOK file to another. We use IOK templates, however, there comes an instance where we may need to modify the original template and add a block. If we already have IOK file using that template, we would need to add and configure that block across all of the IOK files.
You can import ALL the blocks from a workflow in one DataManager file to another. Simply drag the file onto the workflow and select "Import all DataManager blocks". You could then remove the blocks you didn't need. Alternatively, if it is a data-source block you can bookmark that block by clicking the block tools button (spanner in top-right of block) and selecting "Bookmark this block". You can then access this bookmark in any file that you are working on.