Appending to a existing file

Hi new to this.. we receive order files from a client, 1 order per file (delimited csv) and I would like to download and append to an existing csv file so can be imported then delete the transfer file..
is this possible on just the WinSCP script commands?

thanks,

David.

What protocol? With SFTP protocol, you can use:
https://winscp.net/eng/docs/scriptcommand_get#append

thanks it is SFTP we are using