Alert based values in two columns


I have a total inventory column and a reorder point column. I'm trying to make my sheet alert someone when the inventory falls below the reorder point. I can't seem to figure out how. I know I'll need a helper column. I thought I'd do a check box and then have the alert set to when the checkbox is checked. But I can't figure out how to make the check box check!

I don't care how it's done, it's fine if there's an easier way to do it. But if anyone could help me figure out how to notify someone when a figure in one column falls below a figure in another column, I sure would appreciate it.

Thank you!

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