For the input you want to send to another index, simply specify this in the input's section in inputs.conf.
[monitor:///your/file/or/directory] index = yourindex
Thanks, but I am getting the logs of a fowarder on port 9997. Using this I not'll be duplicating the data?
I'm not sure I understand the question. It doesn't matter if you got the data through a forwarder or not. You set this on the instance that's reading the files, in your case the forwarder. Duplication isn't an issue at all.
in the UI you'd go Manager > Indexes > and define the new index name.
Then you'd edit your inputs.conf for that source to point to the name of the new index.
That should do you right.