If Then Statement on Column Cells

None of my usual Excel tricks are working for an "IF Then" Statement on my new Smartsheet Spreadsheet. I am trying to set up a formula so that if cell #18 on Column 8 is "N/A" then "N/A" is returned in cell # 21 but if any other value is in cell #18, nothing is returned to cell #21 as I will need to manually add a value to cell #21. Any help is appreciated!


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