....idiot.. it's so simple...
I knew it, you ll say so...
buttt....
How to do it Superfast
Hold down the "Left Click" on sheet tab and alongside press "Ctrl" key or vice-versa.
Now drag it on the desired place where you want a copy and release the "left click" and then "Ctrl" key...
It's same as moving a sheet but holding the "Ctrl" key down...
Now don't ask me how to move or copy sheet or sheets from one file to another SUPERFAST...
wait for next one...
Said
greatttt