Thanks for you response. Following is the information I got from a forum. Based on that, there is no seeming possibility of considering experience as the alternate of the lack of 4 years education.
USCIS does not accept a combination of education and experience to make up for a degree in trying to obtain EB-2 classification. In order to qualify for EB-2, the position of USCIS is that the position must require at least a MS degree or a BS +5 years post baccaluareate experience. In order to meet that requirement USCIS will currently accept the following:
1. U.S. Master's Degrree
2. 4 year BS + 2 year MS
3. 3 year BS + 3 year MS in related field
4. 3 year BS + 1 year Post-grad diploma + 2 year MS if all in related fields
5. 3 year BS + 2 year MS + 5 years post MS experience
6. 4 year BS + 5 year post BS experience.
If the position is for EB-3 classification and requires a Bachelor's degree, the USCIS will generally accept an equivalency that uses a combination of educational programs, if the Labor certification indicates that the Employer will accept a combination of education to qualify for the BS or equivalent.