partner-contact/portal_partner_select_all/readme/USAGE.rst

#. Go to *Contacts* and choose the tree view.
#. Filter the ones you want to invite to the portal.
#. Click on *Action > Portal Access Management*
#. In the wizard there's now a check box to invite to all the contacts in the
   list.
#. Set it on and a warning will appear advising all of them will be invited.
#. Set it off again and only the already existing users will be checked.