With the freeplay, do (4) 3-team parlays of $250 each, where you like team A (which must win for this to cash) Its basically a straight wager because if Team A wins it hits.
So you would have:
ACE
ACF
ADE
ADF
Again, this is basically a straight wager except this pays you 150% of your freeplay (If your A team wins, you get $1500 cash). Compare this to actually putting the $1000FP on Team A on an actual STRAIGHT wager you would only win $909 cash (NEVER EVER JUST DO A STRAIGHT WAGER w/the Freeplay).
Because some books don't take too kndly about doing the (3) 8 team parlays which guarantees (75%) cash you can do the following risk free wagering but it will pay you less (71%).
In conjunction with the above- in another book bet $781 to win $710 on team B.
If team B wins you win $710 cash and your freeplay (at the other book) is gone.
If team A wins, you lose $781 cash, but your freeplay parlay cashes for $1500, netting you $719.