Two Drop Down Boxes Always the Same, Linked

Good afternoon,

I have searched around and have not found the exact solution to my problem. I have two drop down boxes, within the same workbook, on different sheets.

Is there a way to link them together so they are always equal to each other? I want to be able to select a value from the 1st drop down box, and have the 2nd drop down box automatically change to the same field. I also would like to be able to select a value from the 2nd box, and have the 1st box automatically update with that value.

I am aware that I could make the 2nd box equal the 1st one by referencing the 1st box's cell, but don't know how to make it work both ways.

Thanks in advance!

Edit: I did not mean to post this in the New User's forum; it was meant for the General forum.