So far, it is not possible to copy and paste text with tags from source to target segments in Online Editor as it is possible in Trados Studio. It would improve a translators work a lot if that feature would be available. So far it is only possible to copy the full content of the source to the target. But a lot of times the translators just need parts from a segment including the tags. And the easiest way is to copy and paste from the source and replace the text rather than writing the text and then tag the text.