I'm not sure I understand your question.
But good overview of replacing text with sed seems to be for example here:
How can I replace a string in a file(s)?

Good day! Please help me, I need a command with which I can directly in WinSCP replace the words I need with others using the sed command, for example, to execute a command like sed on the txt I need

that is, I run the command and it replaces inside the document as specified in the sed command.