in all of this sub-folder there is a lot of files

[guy123]

please i have main folder call "TEMP RAW"
inside "TEMP RAW" folder there is a lot of sub-folder
in all of this sub-folder there is a lot of files
but one of those files end with mkv

could you send me rule that that i will download
and it will open in hazel
that will move all those mkv files
to the main folder "TEMP RAW"

[Mr_Noodle]

Search the manual for subfolders. There is a whole chapter dedicated to this topic.

That rule will tell Hazel to go into subfolders. Next, you need to create a separate rule to move the MKV files.

Give that a try and report back on where you run into problems.