Thanks for reply.
I'm Network admin on my current H1B job and plan to find additional network admin part-time job. I found below from FAQ on this website. Somehow it says differently.
Q4 Do I have to continue working for my sponsoring employer?
A4 If you are an employment based AOS applicant, you must continue working for your sponsoring employer to retain your eligibility.If you take a leave of absence, the burden will be on you to prove that you will return to permanent employment with your sponsoring employer. If you wish, you may also accept additional employment with other companies, or even open your own small business. This additional employment must be supplemental to the employment used to qualify you for adjustment of status, however. Family based immigrants and dependents of employment based applicants may work for anyone.