Is there an easier way to do call up info then using a ton of nested IF functions?

Here are the two sheets in question

Instructions

DATABASE

So, here is what I'm trying to do. On the Instructions sheet, there is a drop down box that has all of the departments from the DATABASE sheet. You just select what dept a new a worker will be working in. What I would like to do is make it so that when you select a department from the drop down box, excel will fill in the rest of the information (phone number, address, manager and assistant mgr) using the corresponding info from the database.

I know that I could do this with nested IF functions, you know for the Manager field, like:

=IF(B2=DATABASE!F4, A4, IF(B2=DATABASE!F5, A5, IF(B2=DATABASE!F6, A6, IF(B2=DATABASE!F7, A7...)))))))))

And that's just the manager one. I'd need a similar thing for the asst mgr, address, phone number and other stuff.

I know I could do that and it would work. But I would also need to add an additional IF statement to the end every time I add another department to the database. I was hoping that there was an easier way to do this.

EDIT: Ugh... I spelled "than" wrong. Probably because I had been writing "IF" so much...