Problem with macro to automate copying data from one column to another.

Hello!

I'm handling huge information blocks (schedules, tables etc.)

Unfortunately I've encountered an issue concerning manual copying data from one column to onother.

Would you please be so kind as to help me with an advice -

how to automate copying the values from column A to B,

at that moment, when any value of column "A'' changes.

Consequently when any of column's "A" values changes, all the "A" column's values are copied to column "B"

There should be only values pasted in column "B", without any interrelation.

I've attached a xlsx file with more detailed description.

I'll really appreciate your cooperation