I do not think, there's any explicit mounting interface for either FTP or SFTP protocol. WinSCP definitely does not support any.
But if your system mounts a file system implicitly, when you access the respective directory (as your command suggests), why don't you try the same with WinSCP script?
I have login to the device. Not I need to mount a files system. The command I would use at the command line = cd /mnt/waslcsprod1/middleware/V70A/logs
How can I do the same thing in winscp?
Thanks
jW