My wondering was about that case where ther'll be too much UXTOs that makes the fees too huge !! Then the UXTO to the scond transaction will count as single input, so the fees would not be too high even if settling at maximum!
Sending multiple UTXOs in different transactions and including outputs of one into the next transaction does not reduce the fees you'll pay. It will still be a cumulative fee based on the total transaction size. If parent transaction used a very low gee, the child tx will use a much higher fee to supplement it and make it profitable for the miner.
If you have too much UTXOs wait for a time when the feerate I know and consolidate, or use coin control and only spend few UTXOs which has majority of the amount in your wallet.
- Jay -