union two or more layers without duplication?

[Blighty]

(08-15-2019, 01:41 AM)Human3 Wrote: Just want to click on a button to do a union, lol or join, or whatever between layers, like i can in Silhouette software

I know the Silhouette software. I own a Silhouette machine.

There is a difference between vector graphics and bitmap (raster) graphics.

Silhouette uses vector graphics. (If a bitmap is used it must first be traced to create vector graphics.) Inkscape is also vector graphics.

The image you provided is bitmap. Gimp uses layers. You can't use vector graphics logic on bitmap layers. They are two different animals.