How can I hide a column in Excel that others I send the sheet or workbook to
cannot unhide, but can still add/modify other information in a sheet or
workbook?

You can lock the cells in that column
(select the column|format|cells|protection tab|checked Locked)
Unlock the other cells
Hide that column
protect the sheet (tools|protection|protect sheet)

But xl's worksheet protection isn't made for this. It can be broken really
quickly. If you have stuff that others shouldn't see, don't put it in a
workbook that you share with others.

tjenkgrp wrote:

How can I hide a column in Excel that others I send the sheet or workbook to
cannot unhide, but can still add/modify other information in a sheet or
workbook?

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Dave Peterson