Copy Assets to New Campaign without Cloning Campaign?

For organizational purposes, I'm breaking the campaign I'm running into several different Roll20 campaigns, each of which represents a pretty-much standalone adventure that the party undertakes. I know that it is possible to copy assets (the Journal, the Character Sheets, Macros, etc) to a new Roll20 campaign when I create a new one, but it is possible to copy those assets over to a pre-existing campaign?  I would like to work ahead in creating things, and, when the time comes, I would like to copy the current Character Sheets over to the new Roll20 campaign.  My players will likely level up during the current one, so I'd want their new stats in the new one. If the answer is no, then I'd just have to open up two browser windows and do a side-by-side comparison & update.  It's a bit tedious, but not horrible. Thanks.

It works wonderfully also. If you can get a mentor to host mutliple boards and give GM status to one player per board. You can have a game with multiple GMs and run a continois game with GMs taking turns with their boards.  Board 1: runs the game for his module/adventure then the mentor transmogifier the character sheets to the next board. After that adventure is done the mentor can do the same and copy those updated sheets onto another board for the 3rd GM and etc. No more need to have 2 or more GMs per board unless you chose.