All you need to do to set up Google based SSO on betterworks is log a ticket with firstname.lastname@example.org or alert your Customer Success Manager or Program Architect. If you want to configure SAML SSO, read Configuring SAML single sign-on.
Once Google OAuth2 has been enabled, users can sign into Betterworks using their work email address at app.betterworks.com. This page will then re-direct automatically to your Google Suite sign-in screen. Note that people must use the email address that has been assigned to their employee record in Betterworks and in Google.
For a summary of the Google Apps OAuth implementation approach, read the betterworks single sign-on overview.