I have about 90 separate Excel files each with one worksheet. I can manually
open these and move each worksheet into a master file but this is time
consuming. Is there an easier way to move all these files into one workbook
so that I end up with only one file containing 90 individual worksheets?

I am doing this at work so I am not sure if I am allowed to copy macros for
security purposes. In addition, I am not very familiar with macros but need
to learn. If someone knows of standard Excel commands to do this (maybe an
add-in) that would be great. Otherwise, I welcome all suggestions.

Sincerely,
Jim