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I want to put a formula in a sheet.

Suppose In issue column there are few nos but until those nos will not be posted in Return column, those will not be posted again in another day's issue column, similarly until those will not be returned, those nos will not be posted in issue column. But for the first two days it will not work ad those are first time entries.

But this will be continued working on the next sheet for the net month.

28/11/09 29/11/09 30/11/09 Issue Nos. Return Nos. Issue Nos. Return Nos. Issue Nos. Return Nos. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20