Duplicate selected polygons to same mesh?

Duplicate selected polygons to same mesh?

Hi people!

If I select a couple of polygons and do copy(cmd-c) it copies those polygons into a new mesh.

The problem with that is that I cannot weld points together.

Is clone the only way? Feels kinda clumsy.

How do you people normally solve this problem?

I used the "Mirror" tool. After I had a duplicate of the polygons selected, I moved them to their final destination and used the "Weld" tool to weld them to the connecting points. After that I ran "Optimize" to remove unnecessary points. This is how I did it, I do not know if is the best method.

Optimize is the way to merge identical or near-identical vertices. (There's also "weld" if you want to do it manually one vertex at a time.