Hi,
This code would produce the hierarchy you described:

from chimerax.core.models import Model
top = Model(“Surface”, session)
session.models.add([top])
session.models.add_group([A1, A2], name=“Surf A”, parent=top)
session.models.add_group([B1, B2], name=“Surf B”, parent=top)

Alternatively you could use the “rename” command to reorganize your models into a hierarchy. 

--Eric

Eric Pettersen
UCSF Computer Graphics Lab


On Dec 14, 2025, at 9:09 PM, huybk81--- via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

I tried to read the Programming API but was unable to find out.

Right now:
I created surface A1,A2,B1,B2,D1,D2, etc..
I added these surfaces in a list
surfs = []
surfs.append(A1)
surfs.append(A2)
...
surfs.append(D2)
session.models.add_group(surfs, name="All surface")

This make A1,A2 as models #1.1,#1.2 etc
Interestingly, I cannot even find the document for add_group. I learned this from ChimeraX recipes.

Anyway, I want to organize the data a bit better to have it like this
#1; Surface
---> #1.1 Surf A
-------> #1.1.1 A1
-------> #1.1.2 A2
---> #1.2 Surf B
-------> #1.2.1 B1
-------> #1.2.2 B1

How can we do that?
Best,
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