How do I EM-Extract a subcircuit and define a different em/drawing-layer than the original circuit in AWR?
Reposting from here since they answered the question
at the Cadence Community:

What you are asking isn’t possible although the issue isn’t due to the
extraction itself.    The built-in microstrip models/pcells you are
using read their drawing layer info from the linetypes section
configured in the lpf, and which lpf linetype gets selected is
controlled by either the MSUB name chosen on the corresponding model
or the setting you manually select on the dropdown menu in the layout
cell properties.
Case 1:  If your MSUB definition names match the linetype names in the
lpf, then when you select the appropriate MSUB definition for your
line, the layout will pick the corresponding linetype used for layout
automatically.
Case 2: If your MSUB definition names don’t match your linetype names
then you need to manually set the correct drawing layer using the
pulldown menu in the layout cell’s shape properties.
In either case, there is no way to pass this information down through
the schematic hierarchy which is what you’d need to do in order to
extract multiple copies of “spiral” on different linetypes from a
single top level schematic.   Standard parameters such as width,
length, etc, can all be passed through hierarchy with ease, but MSUB
and linetype are special cases which cannot.
The simplest work around for you is to just make 4 schematics,
“spiral_Cu1”, “spiral_Cu2”,  “spiral_Cu3”, and “spiral_Cu4” where the
correct linetype is pre-set in each and then place them in your higher
level design accordingly.  Any of your usual geometrical parameters
can still be passed to create different sized devices but the pcells
you are reusing are not coded to accept drawing layer information
passed through hierarchy in this way.
Best Regards,
Graeme