When you create a new custom format code,Excel adds it to the bottom of the Type list in the Number sheet in the Format Cells dialog box to make it available for future use.

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When you create a custom format code in Excel, it is added to the bottom of the Type list in the Number sheet in the Format Cells dialog box so that it can be easily accessed and reused in the future.

When You Create a New Custom Format Code,Excel Adds It