Imagine a mesh like the Sphere for illustration.
Now I want to disconnect all vertices in the mesh from each other, but keep every one of them as a single vertex.
Is that possible somehow?
Do you mean to remove the edges?
Because if you split the vertices they cannot become the same vertex.
In Edit mode, select the part of the mesh that you want to remove (if not all), press X, then choose “Only Edges & Faces”.
Nice that’s it.