I have a worksheet with breakdown calculations of hours worked in a given day
for a person (morning block of time, afternoon block of time & possibly a
third block of time). I am now attempting to calculate the total number of
hours a person worked for a given day. I have used
=IF(ISERROR(O2+Q2),"-",O2+Q2) with cells O2 & Q2 being hours worked in a
block of time. Some people have a 3rd block of time in a day (column S) and
if I try =IF(ISERROR(O2+Q2+S2),"-",O2+Q2+S2) it either gives me "-" or an
error, which I know to not be an accurate result.

What am I doing wrong? Thank you!
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heyredone