So what do you want?
set .Options, x; <-- x = Add values together,
Example: You want to 'Enable Reward', 'Mail all rewards', 'Only reward Guild Masters'.
So the x will be 1+2+4=7
set .Options, 7;
Add the reward and it's amount by following the pattern:
setarray .Reward[0],itemid,amount,itemid,amount,...,...;
Example: setarray .Reward[0],501,10,502,5;
The reward will become 501=10x & 502=5x