|By way of explanation:|
The structure of an IF statement is:
IF( condition to test , [value_if_true] , [value_if_false] )
Note that each section is delimited by a comma.
And each Value_If section can itself be another IF statement,
which are referred to as Nested IF's
So in the formula I posted the first section or condition to test is:
=IF ( F$11 = "" , or in words: Test if F11 is blank,
If this returns TRUE, then the second section value_if_true is
"" which means an empty cell or do nothing and processing stops.
If this returns FALSE, then the third section value_if_false is:
Which is simply your original =IF() formula
Does that help?