Let's say you have 2 UTXOs and they are both assosicated with the same address.
One is worth 0.2 BTC and the other one is worth 0.3 BTC. If you want to make transaction paying 0.1 BTC, you can use each of UTXOs you want. You can also use both UTXOs.
But the fees will still be calculated using all inputs??
You don't have to spend all the UTXOs you have to make a transaction.
I think what he meant is that assuming you have 1 UTXO of 1 BTC and you want to spend 0.1 BTC, that there should not be a change (of 0.9 BTC). That just 0.1 BTC should be transferred in the transaction.
Yes! that's just what I'm try to get