Cell B1 is using data validation referring to a named range. There are 4
possible values: Level 1, Level 2, Level 3, Level 4.

I have another named range with the number of days associated with each
Level. So, if the user selects Level 1 from the dropdown list in B1, I want
the default number of days (10) to be put automatically into B2.

If the user selects Level 2 from the dropdown list in B1, I want the default
number of days (20) to be put automatically into B2.

And the same for Level 3 (30 days) and Level 4 (40 days).

I know there is a way to do this, I think by putting the 2 lists next to
each other... but I can't remember how to do it!

Help! Thanks!