HI I AM WISHING TO EXTEND MY BUSINESS VISA FOR TWO MORE MONTHS IN CHINA

Mu business M runs out pm the 28th march. but my work is not finished here and needs more time. i am building a fishing vessel in fuan village and the work progress has taken longer than what was indicated to me.... so is it possible to extend or reapply for and other business M?I I have my invitation letter also...PLEASE CAN YOU ADVISE ME WHAT I CAN DO ABOUT MY SITUATION...

REGARDS
JIM