“Your consolidation transaction” above is key.   

If you send one transaction with three UTXOs to an address, the default would be that you get one utxo at this address= (sum of the 3 utxo values) - fee.   

If you had a shop, for example, pointing to one bitcoin address for each different transaction, the customer purchase UTXOs would accumulate in your wallet separately.   You could THEN send them all in one transaction to consolidate to one (or more if you specify).