come on..this is not the point, there are some need that must be accomplished
You either do everything for them, which you have admitted you cannot do, or you make it as easy as possible for them.
If I was your operator, I would have no issue copying a ramge, as long as you showed me how to do it, if I did not know.
I once created a database for my last place of work, to calculate and report on commisions.
When I was going on holiday I had to show a colleague what was needed to be done. there was a manual as well.
After showing him how it worked, he commented 'that seems simple enough'
I responded with 'You do not know how much hard work went into getting it to look that simple'
I have asked before, Why can you not just use what was entered in the form and filter on that?

You are just replacing one value with another to indicate what that value was?