Hello, please could you advise how to connect checkboxes with VBA to adjust excel files.

I have excel files for 11 entities (countries).
I need to do adjustment sometimes on each of them or sometimes only chose which file should be adjusted.

I created checkboxes with labels:
Code:
 x  Select All
 x  country1
 x  country2
......
......
 x country11
I need Access VBA for open,...