Suppose I have an excel workbook with two sheets X and Y.

In X I have a set of data in columns A and B,
1 4
2 5

In Y I want to perform calculations on the data in A,
In cell Y!A1 I have "=X!A1+X!B1", etc.

What I would like to do is delete worksheet X, with the formulas in Y locked
and still refering to X, and insert and new worksheet, rename it X, and have
Y perform the calculations on the new data.

Unfortunately, when I delete X, I get =#REF!A1+#REF!B1 in Y, and can't
recover the reference to worksheet X.

Any suggestions?

Thanks