use electrum, let me show you.
Format will be :
Address, amount
Address2, amount2
Address 3, amount3
Screenshot
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This is great It was good to learn this feature.
Normally, when you pay an address, we enter an appropriate fee value. So when we pay more than one adrese, can we just enter a fee value? Do they affect the approval period of payments sent to addresses?
Electrum will compute the right fee for you, but you will be always saving in fees on bulk transactions (you only pay for the output), this is why most exchangers like localbitcoins send bitcoins in bulk every 10 seconds to save in fees (they save in monthly fees enough to pay at least an employee) so that matters a lot.