Scott Forrester bagged a brace and missed a penalty as the Dons over-ran CCL Cobham in the rain.
Forrester opened the scoring in the 13th minute, converting from close range after Richard Butler had provided the legwork for Amadou Kouman's pinpoint cross.
Kouman also set up the second after 25 minutes, slotting the ball through for Butler to slide under the advancing keeper. Butler should have added to the tally but skewed the ball wide of any empty goal after taking it around the keeper.
Butler made up for his earlier error five minutes before the break, playing in Forrester for his second and the Dons third.
Forrester's change of a hat-trick came just two minutes later after Barry Moore was sent tumbling in the box, but his spot-kick was well saved.
The flow of second half substitutes failed to change the flow of the game. With 20 minutes to go Leon McDowall crashed a header against the bar and Matt Yorke was on hand to crash home the rebound from 20 yards.
Three minutes later Kouman wrapped up the scoring with a close-range downward header from another corner.