How does data validation work?

How does data validation work?

Pick a cell to display the results. On the data tab, select data validation. change 'allow' to 'any value'. click inside source and use your mouse to highlight the list of policies on main data tab. hit okay.

Pick a cell to display the results. On the data tab, select data validation. change 'allow' from 'any value' to 'list'. type in the policy numbers that are to be allowed. hit okay.

Pick a cell to display the results. On the data tab, select data validation. change 'allow' from 'any value' to 'list'. click inside source and use your mouse to highlight the list of policies on main data tab. hit okay.

Pick a cell to display the results. Use $=$dataval$()$ function. change 'allow' from 'any value' to 'list'. click inside source and use your mouse to highlight the list of policies on main data tab. hit okay.