Convert from target worksheet to specified range

[VCharles]

Having some issues with the following:
Can't quite get this to target a specific range as opposed to each individual cell in the worksheet.

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[Norie]

What range do you want to target?

[VCharles]

Columns E-G as illustrated in my workbook. I would like each row to be validated against one another vertically but taking into account the collective info of all three columns, not just a cell-by-cell basis.