okay, Thank you ! I found it… 
Now how might I use an “array” instead of a mesh when replacing “meshes” to spawn as I drag the manipulator ?
and how might I still be able to change the number of meshes in those arrays, even after pulling along a row of them using the manipulator/ fence thing ?
cause this would work amazingly for my purposes !!!
I assume I will edit the BP_Fence… and somehow, relink an array to where the mesh node is currently ?
any advice to edit the BP will be MUCH appreciated !
also… I see that the 1.1 example using a construction script to populate an area with meshes can be edited on the fly… but I can populate an area with ARRAYS too ?
and how might I keep the populated meshes in rows etc ?
all this must be able to be done via the BP…
how might I do all of the above ? I do not know BP too well but can surely learn quickly…