Using a skybase I found and it loads in fine.
I modify it by adding some extra floors since it does NOT use ANY FOUNDATIONS. (Its a SKY base)

Anyway - all fine. Then I add some more floors at the back to stick on a pool area.

I have tried multiple times to copy but, whenever I paste I get issues.

Its not copying the floors around the pool and some others can be missing.

Also it loses the information on things - it has banners attached to the walls with a nice picture - this loads in fine first time but, it seems forget on the copies.

Also sometimes I can remove something with no issues, other time the same thing I have replaced without issues cause the whole build to fall apart for no reason.

I just want a simple way to add to an exisiting pasted skybase and copy it so I have a new version.

I have tried various copy and paste commands...

so to be clear I first paste in the skybase
Then I modify it
Then Im trying to save it with that modification

/copy SkyBasePool method proximity radius 7 share true tree true

/paste SkyBasePool a true deployables true inventories true s false entityowner true height 200

As said though I end up with parts missing, also info missing from pictures and hanging banners and also on times removing or picking up say a hanging banner, door or wall causes the whole base to explode and fall apart out the sky.

I have a skybase copy paste file also, spawns in okay with me (although I do have some foundations in the build). Could try typing the longer stability false part in paste option instead of 's false', and also I would recommend zone manager, you can create a zone around the base and add a NoStability flag.