Dear Diehl:

Whether do you mean:
Each wind case(total 4 cases can be defined in the window) can be defined one direction in "Wind Direction Cosines" ?
For example,
if case 1 seleced for wind case, then I define "1" in "X Wind Direction Cosines", So this mean the WIN1 will be "X" direction,
then, case 2 seleced for wind case, then I define "1" in "Y Wind Direction Cosines", So this mean the WIN1 will be "Y" direction,

In my load combination, I can use WIN1 and WIN2 as wind load direction.

Whether my understanding is right?