FOSS gamedev and creative worlds

Is it possible to copy an structure like a tree or a house and save separately of the world to send to another ?
How ?

Search for the mod Worldedit in the Minetest forums. It will do the job nicely.
It's a very powerful tool for many more things then backing up items.

The build chest from my villages mod will also eventually be usable for that.

Thanks for yours sugestions.
ExeterDad, i learning and trying the use of this mod.
It`s look like incredible, thanks.
Sokomine, i saw your lot of mods-works, you a hard-worker programmer ...
Thanks to both.
I`m new in that building thing on minetest.
I`m building a city and some parts (streets and ladders the most) repeat and be so tedious work in this.
Very thanks to boths !

I`m steel getting experience with WorldEdit, but cannot find the way to copy and paste.
I can save a region and load, but the copy and paste instructions are not available.
Sorry for my inexperience and my english !
Some lifeguard from somebody with experience ... ?

Save and load is the way to it, there is no copy and paste as such.

Like RubenWardy said use save and load
select your area
type //save <filename>
then when you are ready to place it make sure your yaw is 0 or very close to it.
when you load it will load out and to the right.
set position 1 and type load <filename>
you can save as many files as you want

Thanks for all yours advices, i`m getting experience with this "super powerfull" tool.
My admiration to the creator and my greatfull to all you people to help me.