@Nandy7071,
I just had a thought that could possibly speed up your process greatly depending on how your data is laid out. You said earlier that you have 10 columns of 4500 formulas on 30 sheets. I don't know if you have other cells with either constant numbers or text on those sheets or not, but can you manually select just the columns with formula numbers only? If so, the following procedure should be quite a lot faster even though it is an entirely manual procedure. For the
first sheet...
1) Select the columns with your formula numbers in them
2) Press CTRL+F to bring up the Find dialog box
3) Put 0 in the "Find what" field
4) Click the "Options>>" button and make sure the "Look in" drop down has "Values" selected and put a check mark in the checkbox labeled "Match entire cell contents"
5) Click the "Find All" button
6) Press CTRL+A (this will select all of the found cells)
7) Leave the dialog box open and click the "Clear" button on the Ribbon (Home tab, Editing panel) and select "Clear All" from the drop down that appears
Now here is where the time saver comes in...
8) Select the next sheet and select the formula columns on it, then repeat steps 5, 6 and 7 (you do
not have to repeat the earlier steps for the rest of the sheets).
I am pretty sure the above procedure should move along at a remarkably fast pace so long as you can pick columns of data that do not contain cells with the constant (non-formula) 0 in them (they would be cleared along with the formula 0's if they were included in your selection).