Automatically number rows - Microsoft Support
https://support.microsoft.com/en-us/office/automatically-number-rows-76ce49e3-d8d2-459b-bd85-ee1d3973e6e6
WEBTo enter specific sequential number codes, such as purchase order numbers, you can use the ROW function together with the TEXT function. For example, to start a numbered list by using 000-001, you enter the formula =TEXT(ROW(A1),"000-000") in the first cell of the range that you want to number, and then drag the fill handle to the end of the range.
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