What are the possibilities of doing another job for L1A holder?

It is not clear what your are asking. Are you asking whether you could switch employers? If so, the answer is no. Your employment is tied to a specific employer and L-1 status cannot be transferred to another employer. You would need a different nonimmigrant status to change employers. If you simply wish to change positions within the company, this may be possible. You may need to change your nonimmigrant status depending upon the duties of the new position. You can read more about L-1 visas at http://myattorneyusa.com/overview-of-requirements-for-l1-and-l2-visas.