Ok. If that’s the case, there are 2 things you could do here.
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Log a payment against each invoice individually, from the invoice itself (as per the guide), to the GBP account - if you know the GBP equivilent. Or,
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Create a new USD bank account, record each of the invoices as paid from here (so they’d be in the same currency), and tag the £3,644.09 as a transfer from the GBP account to the USD one