Create a dropdown box with files that have formulas

My question is:
I would like to have a dropdown on the Master Monitoring File that would allow a person to only have to open the Master Monitoring file instead of opening the other 3 files.
As you can see, each of the 3 files have it's own scoring tied to a specific sheet on that file.
I was trying to see if all 3 files could be in 1 master file and be chosen by a dropdown.
If this can be done, would you be able to explain how?

Administrative Note:

Welcome to the forum.

We would very much like to help you with your query, however the thread title does not really convey what your request is about. Tell us what you are trying to do, not how you think it should be done.

Please take a moment to consider amending your thread title. Make sure that the title properly explains your request. Your title should be explicit and not be generic (this includes function names used without an indication of what you are trying to achieve).

Please see Forum Guideline #1 about proper thread titles and adjust accordingly. To edit the thread title, open the original post to edit and then click on Go Advanced (bottom right) to access the area where you can edit your title.