Instead of calling each cell individually. Create a collection containing the cell references (would recommend naming the cells and addressing that name rather than the cell number e.g. cell A5 contains a staff name or something, call that cell 'StaffName' or something).
So the collection will have a field called A4, A6, B9 etc. Or the fields would be called StaffName , Salary, JobTitle etc. Whatever you're tryign to capture.
Then have a loop or a conditional statement, whatever you prefer to cycle through and address each cell reference and store it in your collection.
This way if you ever want to add/remove an item you just add/remove additional item fro mthe collections lsit of fields.
Additionally if you were extracting data from multiple excels all in the same format, you can add a new row for each one and build a lsit of work items that way.
Hope that helps