If what you imply by:
We can see the disks on the network but can only find an archiving configuration.
Is that from a single machine only a TC drive can be used at any one time for Time Machine backups, then that is true.
Time machine can only backup one machine's hard drive(s) (all the hard drives on that machine if more than one) to a single TC hard drive. Subject to any exclusions you have specified - either an entire hard drive/partition or folders to be excluded.
You can back up different machines to different TC hard drives.
For example on one machine with 2 hard drives, you cannot back up one hard drive to the TC disk and the other to one of the USB attached drives. Similarly you cannot backup some folders on a hard drive to one TC disk/partition and another to a different one, without a lot of manual intervention switching drives and forcing backups.
Nor can you seamlessly backup one machine such that after filling one TC hard drive it will continue on another drive. You can archive or switch drives when the one being used fills up. This allows you to search one and then the other in Time machine. But it does not present a seamless composite that spans the backups on 2 drives.