Synchronise selected files in a folder

Hi Martin and everyone
I have several folders for my (ancient coins) website, each with several hundred sub-folders. I add files (images, thumbnails, text files and the html files to sub-folders in alphabetical order about once a month but never have time to do them all in one session. The main folders are named, e.g. greece, ric, byz, brit etc and each of these folders has a large number of sub folders (under "greece" for example, there are acarnania, arkadia, aeolis, apulia, arabia etc...) and each of those sub-folders have their own city folders with two html files plus all the images and text files for coins from that city.
Tonight, for example I added images etc to the ric/ sub-folders A to D.
I do a synchronize run but because there are so many sub-folders for about 76,000 coins - it can take a long time.
Is there a way I can tell the program to synchronize only certain sub-folders ? e.g. just to synchronize acarnania, aeolis and arabia (using the above examples)

You can use Selected files only option:
https://winscp.net/eng/docs/ui_synchronize

Or you can explicitly exclude folders, that you do not want to synchronize, using a file mask.

Hi Martin
I already use the Synchronize system but the "selected files only" wouldn't work for me, because I need to select entire folders to be synchronized, but not ALL the folders under e.g. /greece/.
So how would I make it synchronize, (for example) the folders and contents under
/greece/thrace/ and
/greece/macedonia/ and
/greece/illyria/
and not all the other /greece/,,, region folders ?
? Could you tell me what such a mask would look like and where it would be added ?

But that's what it does, doesn't it?
Note that "files" quite often means "files and folders" (and it does in this case).

Sorry, I am probably not making myself clear.
When I select the /greece/ upper folder and use Synchronize, of course it synchronizes ALL the 120 sub-folders from greece/aeolis/ to greece/zeugitana which takes a long time (ca 15 minutes or more because of the large number of files in all 120 subfolders).
But if I have only updated (added files to) four or five of those subfolders, I want to limit the job to synchronize only the folders I want it to check, not all of them.
Of course I could select the subfolders one after the other, but I thought I could tell it, "synchronize only greece/thrace/, greece/moesia/, greece/macedonia/ and greece/illyria/"

So go to greece in both panels and select the subfolders you want to synchronize (it's enough to select them in one of the panels only).
Or are there more top-level folders (in addition to greece) that you want to synchronize?

Thankyou Martin, I need to add more photos and txt files today and will try that on some different regions (pontos, phrygia and macedonia).

(Later) - Yesss! That worked. I marked the folder names using left mouse button to select the first then the left button + CTRL to mark the others. Clicked "Synchronize" and marked "Selected files" and it did exactly what I wanted it to do.
Thankyou so much.
What a superb program this is. Everyone who uses it should make a donation!!