on leafnode and multiple servers

I use Leafnode successfully with the great Eternal September USENET
service.  I also have access to other NNTP servers, which I also would
like to cache with leafnode.  I set them up in Leafnode configuration,
but I see that Leafnode tries to download from these new servers the
same groups that it downloads from Eternal September.  But I wish it
would look for other, different groups.  Is that possible with Leafnode?

I don't know how to use Leafnode very well.  I discovered the directory

  /var/spool/news/interesting.groups

and touched files there with the names of the groups I'm interested in
Eternal September.  Apparently, nothing there says that these are
relative to Eternal September, so I don't know how I'd specify a
different set of groups to be downloaded from other servers.

I appreciate any guidance!  Thank you.