Hi,

To grant portal access to multiple customers, 

1)First change the Kanban view in to List view

2) Select the customers to give portal access

3) Action -> Grant portal access

Hope it helps

Hi Faisal,

Yes you can customize using server action with executing python code selection.

portal_wizard = env['portal.wizard'].create({})

portal_wizard_users = portal_wizard.user_ids.filtered(lambda user: not user.is_portal and not user.is_internal)

if portal_wizard_users:

  for portal_wizard_user in portal_wizard_users:

    portal_wizard_user.action_grant_access()

message = 'Granted portal access to : %s contacts' % str(len(portal_wizard_users.ids))

log(message, level='info')

Check if this works for you!