Hiding columns without protecting Sheet

[VisionSmart]

HI All

Have a Workbook with many tabs and some very complicated formulae in several columns which are hidden.
I want to allow others workers to use workbook but not allow them to unhide the Columns.
Sheet to remain unprotected as areas (including hidden columns) are allowed to be copied and pasted to same format down the sheet as extras are required.
If column is hidden, then I assume formulae don't need to be hidden?

Can someone please assist with VBA code to hide and unhide please?

Example attached