Set Workbook permissions
Define Workbook permissions
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Modify data or formulas
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Password
Set up Workbook protection
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Go to File tab > select Info > Permissions > click Protect Workbook
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Select one of the following the options:

Assign permission to modify certain range in Worksheet
- Select the range needing to be protected
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Go to Home tab > Cells group > click Format > Protection section > select the following
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Click Lock Cell to unlock the cells
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Click Protect sheet

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In the Protect Sheet dialog box, do the following:
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Clear Select locked cells check box (only allows other users to modify within unlocked cells)
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Under Password to unprotect sheet section, set a desired password in the text box

