?

if c>ma20 and c>ma5 then buy(1,100%,marketr);

if c>ma20 and c<ma5 then buy(1,50%,marketr);

if c<ma20 and c>ma5 then sell(1,50%,marketr);

if c>ma20 and c<ma5 then sell(1,100%,marketr);

?

多個條件分別建立就行了