When you are attempting to purchase content, there should be an option to change the payment option. You should then be shown a list of payment options, which should include one labeled "Microsoft Account: $x.xx" Your Microsoft Account balance is essentially
what use to be your Microsoft Points.
At this time, there is no way to pay to a partial amount using your Microsoft Account balance. You must pay in full with whatever payment option that you choose.
Therefore, there is no way to pay say $5 of a $10 DLC using one payment option and then use another option to pay the remaining balance.
I hope that this helps.
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