When I was using stock contacts and sync with Google, I could put relevant contacts in My Contacts group which is the only group synced by Google. I have installed GO Contacts and it now displays all groups except My Contacts.
What I want to do is to group irrelevant contacts somehow and hide them from my phone contacts or ignore them in sync. Please note that I do not want to mess with My Contacts group in case I decided to go back to stock Contacts.