We have already had this - RISC OS is different, works differently.
It has been a long time since I used samba or any other network file system, but it should not be too difficult.
Although I seldom ever use graphical file managers - I just can’t describe how it would work only with Thunar, which you seem to prefer - or with Dolphin or whatever.
The Arch wiki is usually the best place of information - but they won’t describe how to handle your graphical tools.
Basically, you mount your samba share (using its protocol and address) to some directory of your choice.
That directory IS your mount point, through which you can access the share by PATH.
I’m sure much has bee written about samba/smb/cifs here on the forum as well.
here you are, for example:
Thunar: How do I access folders shared on Windows computers?
Another hint re Thunar
https://superuser.com/questions/1645590/thunar-cannot-browse-network
I think the package is called gvfs-smb in Arch/Manjaro.
Something with gvfs in the name.