How can I hide irrelevant contacts in Go Contacts? 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.
Not sure if this will answer your question, but there is a Settings (button) called "Contacts Account" which lets you show or hide the following contacts:
- Phone
- Google
- SIM
- Facebook
- Twitter
- Show contacts with phone numbers only