There are a few intermediate voltages but I don't think it's very common and is probably only in places that have had a supply for around a centuary...
Here the primary substation is fed by a 33 kV line and back up 11 kV line. I think the 33 kV orginates at Penrith, the 11 kV from the primary at Little Selkeld. The 11 kV has a regulator in circuit a couple of miles from the primary substation. Even with the regulator our voltage wangs about all over the shop when the back up 11 kV is being used. Rises to above 255 at night and drops to 225 ish during the day. 240 to 245 is the normal range. It was complaining about the over voltage that lead me to finding out the 11 kV was fed from Little Selkeld, as they dropped a couple of hundred volts off it there and things got better (only 253 overnight) but doing that reduces everyone else fed from that line so it didn't stay like that. Presumably the regulator is hitting an end stop at night...
From the primamry substation the 11 kV distribution is constructed as a collection of half a dozen or so interconnected rings. These rings are normally operated as spurs with an auto reclosure on each one near the primary. Manual operated air swtches that are normally open or normally closed enable any section of line to be isolated or fed from either end. There are a number of spurs, some branched, that can only be fed from one end. We are on the end of one that only feeds us.