Assuming you have four check boxes...if you were to select check box#3 and checkbox#4 you will use .
This approach doesn't take into consideration, the check box properties. It gets all checkbox items and selects all if used in for loop. To select a particular check box, pass its index where the first occurence of a check box is given index '0'.
Code:
Set myObj=Description.Create
myObj("micclass").value="WebCheckBox"
Set allObjs=Browser("...").Page("....").ChildObjects(myObj)
allObjs(2).Set "ON"
allObjs(3).Set "ON"