what do you mean by reload?
how i can claim to get the free bet again after the free bet have already been used?
There are sign up offers and reloads. There are reloads on certain horse races but there is not guarantee of profit. For example some bookies such as Paddypower offer a free bet if you back a horse that comes in 2nd to the SP favourite on certain races every day. Others may have a similar offer at the weekend on Channel4 selected races. Skybet offers a £5 weekly freebet if you bet more than £25 per week (more than £40 for the first week). Similarly there are football reloads such as the Man Utd one mentioned on a previous page.
One thing you must do is mug bet and not just go for offers. If you go for offers then you'll soon get flagged as an offer abuser and have your account restricted or closed.
I don't advise the multi-accounting approach as it is considered as a violation of bookie T&C's or worse as fraud. May not end up going to jail but a bookie would be within their rights to take back all of the winnings and close the account.