These are all kinda related.
- Allow multiple docs to be open at same time. Tabs would be nice.
- Allow copy of selected items (without paste at the same time).
- Allow pasting of selected items into another open or soon to be opened c4c doc.
I believe this would save a lot of time when needing an additional alternative version currently taken up by either delete all unneeded elements and save as or re-creating files from scratch by just having to copy and paste.