Formula Question:How do you automatically calculate information

How do you automatically calculate information in unhidden cells that contain
a formula to calculate from another spreadsheet that shows data and hidden
cells that have a formula to calculate from another spreadsheet that returns
a Div/0! because data is unavailable without the formula result being Div/0!
because the hidden cells do not contain any data?

It's probably best to suppress the errors in the first place. If you have a formula like

=A1/B1 which gives a #DIV/0! error then you can change to

=IF(B1,A1/B1,"")

alternatively you can sum a range, say C1:C10, and ignore #DIV/0! errors with

=SUMIF(C1:C10,"<>#DIV/0!")

In your final worksheet use, IF(ISNUMBER(A1),A1,""), or
IF(ISERROR(A1),"",A1). ed