I've found that if the SVG that you are importing has a top layer, the layers are preserved.
Start: new.svg (importing into this file) Icon Layer (select this layer before importing)
import.svg Icon > Final > Dimensions
After: Icon Layer > Icon > > Final > > Dimensions
A bit cumbersome, but preserves layers without needing to do mess with grouping.
I've found that if the SVG that you are importing has a top layer, the layers are preserved.
Start:
new.svg (importing into this file)
Icon Layer (select this layer before importing)
import.svg
Icon
> Final
> Dimensions
After:
Icon Layer
> Icon
> > Final
> > Dimensions
A bit cumbersome, but preserves layers without needing to do mess with grouping.