If you want to duplicate a range, formulae included, exactly as is, then convert the formulae to text, copy, and convert both source and destination back to formulae.
Select the range to copy. Do menu command Edit/Replace, changing = to #, Replace All, which converts the formulae to text. Copy, paste in whatever location you want.
After pasting, do Edit/Replace on both the source location and destination, changing # to = and you are finished.
Hope that's what you want.
Glenn.