Is it possible to exclude a specific cell in an array of data from a formula?

Every so often, there is a single cell of data that we want to "hide" from the data summary. Is it possible to set the properties for this cell in a way that the formula does not see it? We don't want to delete the cell or change its value.


the formula below refers to one spreadsheet of several "Avastin100".
Each Spreadsheet has multiple rows of data. Each column in the sheet represents a specific monitor. In this case, the data of interest is in column X. It is not feasible to modify the formula to exclude one cell in the column. If the data was deleted fromt the cell, it would solve the problem but, that is not desired.
=IF($E6=0,"N/A",(SUMIFS(Avastin100!$X:$X,Avastin100!$I:$I,"1st Inspection", Avastin100!$A:$A,"*SSF*",Avastin100!$AZ:$AZ,"="&"Y",Avastin100!$D:$D,">="&EDATE(G$4,-12),Avastin100!$D:$D,"<"&EDATE(G$4,0)))/E6)

The formula is looking at possibly 50 or 60 cells...rather than add more complexity to the formula, I would rather change the properties of the one cell to make it unavailable. The other option is to delete the information in the cell but the company does not want to do that.

Changing the property of the cell from numeric to text will prevent it from being summed.
Adding a trailing spacing to a text value will eliminate it from the SUMIF() criteria.