Сonnection Beam

Можно сделать цикл по всем connection beam, внутри которого создавая нужный snippet.

например, вот так:

list_of_beams = ExtAPI.DataModel.Project.Model.Connections.Children

for i in list_of_beams:
#    print i.Name
    command_snippet = i.AddCommandSnippet()
    command_snippet.Input = r"""!   Commands inserted into this file will be executed just after the beam definition.
!   The material, type, and section ID number for this beam is equal to the parameter """ + "\"" + r"""_bid""" + "\"" + r""".
!   Active UNIT system in Workbench when this object was created:  Metric (mm, kg, N, s, mV, mA)
!   NOTE:  Any data that requires units (such as mass) is assumed to be in the consistent solver unit system.
!                See Solving Units in the help system for more information.

test snippet
"""

Похоже, что этот метод только в 2021R1 для beam появился. Попробуйте тогда так сделать:

import context_menu
for i in list_of_beams:
    i.Activate()
    context_menu.DoInsertCommandEditor(ExtAPI)