How do I make a VIA sliding PLANE for a GND plane uncoated surface_?
How do I make a VIA sliding PLANE for a GND plane uncoated surface_?
The bottom layer of the marked place has GND PLANE. Some points on the top layer cannot be covered by GND PLANE. Here I want to overlay VIA units GND PLANE. Is there a special element for this?
Use the Copper Area tool.
Draw a Copper Area around where you want the copper.
Assign it to the GND net (which is the default anyway).
Set Keep Islands to No.
For more about Copper Areas, see the Tutorial, (1) in (2) in:
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Please post some images to illustrate what you are asking about.