How can i delete a 'backups' from time machine for a computer i no longer have

i have been using my time capsule for a few years now, everything was great until my imac died and i had to replace it
when i did, the time capsule worked perfectly, as it allowed me to "migrate" all my backed up data onto my new machine, joy
but now, as it wants to start its backups of the new imac, there just isnt enough disk space on the drive, and i suspect this is due to every file on my new machine is marked as never have being backed up which means i need like 400G, and most of the time capsule's space is still consumed by the old backups
how can i remove this old back up from the time capsule without reformatting the whole drive (i have other machines that are still using the backup service and i dont want that interrupted)
it just seems like, since i am no longer on the old machine, i cant access that machine's backup in order to delete them (through the time machine interface), and i cant seem to find a single tutorial on how to do this that is written in non-programmer speak (i really dont feel comfortable cracking open terminal and command-lining this sort of thing)
am i just nuts or is this really all that uncommon a problem with no easy solution?!?
any advice is appreciated, thanks in advance

how can i remove this old back up from the time capsule
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http://pondini.org/TM/12.html
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Your post is too difficult to read. Please repost using paragraphs.
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Muizen wrote:
Thank you WZZZ.
1) I am now specifically looking for info regarding deleting emails from backups.
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Delete all backups of <home folder>/Library/Mail, per Time Machine - Frequently Asked Question #12.
And exclude that folder from future backups, per FAQ #10.
2) In addition I feel that being somewhat better in control of TM that it would be an advantage to really clean out TH completely and start a new back up, thereby systematically blooking certain matters from backing-up since there is no need for doing so.
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How can i delete a 'backups' from time machine for a computer i no longer have

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