Method of spending LTC Litecoin from a paper cold wallet?
You can import the private key, spend part of it, send the change back to the same address, and delete the key. This would leave a lesser amount in the same paper wallet, but is generally not a good practice (address reuse).

Also, if the address has multiple inputs, you can just spend X if Y distinct inputs with exact change and that will work too.

litecoin-cli importprivkey 1LYourPrivateKeyThatIsWrittenOnThePaperThatYouWantToKeepForSomeReason