I would like to know if it is possible to transfer my current wallet to this hardware, without creating a new wallet on the Ledger. Please notice that I don't want to create a new wallet. I just want my new Ledger to handle my current wallet. Is it possible?
Possible? Yes.
Recommended? No.
The whole purpose of a hardware wallet is that the seed is being generated AND kept in an isolated offline environment.
If you use your seed which has been generated OR entered OR used on an pc with had an internet connection at ANY time, you are destroying the whole purpose of a hardware wallet.
You might as well stay with a desktop wallet in this case.
Just create a transactions. Fees are relatively low currently anyway. Don't cheap out on transaction fees. You are risking all of your coins which will be stored on your nano s (currently AND in the future) if you don't generate the seed properly.