added on to Sunken Citadel module can I run it concurrently with a different group of characters?

Hello, I started a campaign with the Sunken Citadel module with a group of characters, then I added on several maps and characters and homebrew things stemming from events started in the Sunken Citadel, turning it into quite the campaign. I am still running it with that original group.  Is there a way that I can start the adventure again with a new group of characters, and keep all of the pages I added, and not have the two groups get mixed up together? Thanks

Copy your game.  There are several things that have a checkbox for what you want to be copied, so you can copy the maps, handouts, etc. without copying the players in the new game as well.

Also, if you want to "re-set" the Sunken Citadel portion, you can create a new game and then use the Transmogrifier to copy over your custom pages.