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If I don’t have enough miles in my account, can I top up my miles to pay for my flight tickets?

No. The top-up option is only available for flight awards and is not applicable for purchasing flight tickets with Miles Plus Cash.

More about Miles Plus Cash other features

Are Miles Plus Cash payments treated as mileage use, thereby extending the expiration date of my miles?
If I book flight tickets or purchase travel extras with Miles Plus Cash, can I still earn miles for my purchases?
I'm paying with one of Cathay’s co-branded credit cards, can I earn miles from the Miles Plus Cash payment?
If I purchase a flight ticket with miles in full, is it considered a flight award ticket?
Do I still have the option to redeem flight award tickets using Asia Miles?
Do I still have the option to redeem travel extras using Asia Miles?