...
- Select the subalignment;
- Select the Copy/Paste->Copy (custom format) context menu item in the context menu or use hotkey Ctrl+Shift+C.
The global Options Panel tab will open:
HTML <center> <br> <img src="/wiki/download/attachments/1746764565929647/Copying-Pasting Subalignment.png"/> <br> </center>
Select format and press the Copy button.
...