@Tom W. Hi Tom,
Thank you so much this sorts all my issues!
Regarding hiding a an edge, I didn't think about it, will do so.
I'm looking now at the fence tool, I didn't even know it exist, great finding, looking at some tutorials online.
For whoever that can answer this:
About the Fence/Rail tool is there a way to only add lengths that are multiple of the length of one unit.
For example, the unit is 2,5m long, to only do fence lines that have a length multiple of 2,5m that doesn't cut units of fences or barriers?
Thanks everyone
Julia