Hello L762116 ,
For now, you'd have to recreate the block from scratch in the new email, if you aren't copying the entire email it was originally part of. You can save some time by copying and pasting the text, as well as hexcodes for coloration, but it would still require manual reconstruction to some degree.
If you intend to use this block/layout/section a lot going forward, it may be best to copy the email and make a reusable template out of it. That way, you can always create a new email, select the saved template on the template selection screen, and start with those parts already constructed.
I'd also recommend voting and voicing your use case on this existing Product Idea. There are plans to have this functionality released within the first half of 2026, but this is a good thread to at least be subscribed to for updates.