Create run time session value

Hi I am very new to this language.
Very keen to know how can i convert the session script to parameterized.
Example:
open martin:#loius@server1.example.com
Should be converted to
open %var1%:%var2%@%var3%

Where
var1=martin
var2=loius
var3=server1.example.com

Actually i am using following commands mentioned below and need to generate the session value run time.

option batch on
option confirm off
open Martin:loius@server1.example.com:22 -timeout=7000
cd \
cd \Process
option transfer binary
put -nopermissions "\\OUT\*.txt"
close
exit

In need to use parameter to provide user,password and session value.

Please revert.

Please read documentation:
https://winscp.net/eng/docs/script_upload_multiple_servers