Merging layers and its sublayers

It would be great to have an option to merge objects in nested layer structures. For example:

│ ├── Option-1
│ │ ├── Sublayer1
│ │ │ ├── Sublayer2-1
│ │ │ │ ├── Part1
│ │ │ │ ├── Part2
│ │ │ │ ├── Part3
│ │ │ ├── Sublayer2-2
│ │ │ │ ├── Part1
│ │ │ │ ├── Part2
│ │ │ │ │ └── Detail1
│ │ │ │ │ └── Detail2

│ ├── Option-2
│ │ ├── Sublayer1
│ │ │ ├── Sublayer2-1
│ │ │ │ ├── Part1
│ │ │ │ ├── Part2
│ │ │ │ ├── Part3
│ │ │ ├── Sublayer2-2
│ │ │ │ ├── Part1
│ │ │ │ ├── Part2
│ │ │ │ │ └── Detail1
│ │ │ │ │ └── Detail2

Merge all objects in Option-1 with Option-2 and retain this structure. This could for example be added to the menu in the layers window:
image

What specific problem would this solve for you?

When using Make2D with different elevations I would like all of them to retain the layer structure of the original 3D model (using “Maintain source layers” option). But each Make2D produces a separate layer tree.

It’s easier to share elements and to assign attributes via layers when they are within the same layer tree rather than separate.

image