I'm pretty new on OTRS but anyways, have to get it working like I "want" so I decided to ask here since you all are pro's to me

I've updated our test-servers for using customCompanies etc.
Now we want to update our live-server (3.0.9) to the latest version to add those customers into kinda "list".. This works fine with the new-ones that have been recently created and send us an email to support@comany123.com .
But what about the older ones? they can't be edited and listed so far. In the ticket they wrote is the email mentioned as the customerID but we want to kinda sort them into the list (like mrpeter@comany3.com -->customCompany: Company3 <OR> mrpeter (as username which has been added to the customerCompany).
Okay, the old tickets doesnt bother us anyway. Who cares what happened 2 years ago and was solved? But what if mrpeter@comany3.com writes an email right now and we'll add him (because we didn't know him untill yet) and he doesn't show up in our customCompany List?
is there any Way to edit old-tickets/data?
Thanks for reading so far and thanks for upcomming answers.
Sorry for beeing so newby

piccolo5