H1 B RFE for specialty occupation


I got RFE to provide progressive evaluation document. my employer already submitted evaluation document during H1 B extension. I got RFE asking document evidance showing progressively responsible work experience in the field related to specialty.

I am having 12 years of experience in IT (10 years in India) having experience letters-2 years in USA. my Employer thinking to request to trustforete corporation for professor evalution document but trustforete corporation will ask details experience letter like project details, project duration tools/software used during working in particular company, but Indian employers does not provide such detailed experience letter, they simply mention name of employee, designation, tenure.
Please advise how to handle this case/can you share acceptable experience letter template so that i will share that template with my Indian employer for signature or is there any additional document that we need to share with trust forte along with experience letter?.