Thank you @Vanessa A for further explanations!
The term 'Service' is really confusing. I am not a sales/marketing/professional service person. I went to CA/NY/other states for my company internal meetings, team bonding activities, trainings, and between those activities, I did my normal work, working on some research projects for my companies. None of those were client/deals/contract involved. So I actually didn't have any 'Services performed in CA', and no CA and other states income tax liabilities, right?
Thank you for your help!
