You can transfer family visit visa to business visa.

As your current sponsor to write on a white paper a No Objection Certificate with the name of the company which will apply your business visa that he doesn't have any objection to transfer your family visit visa to (name) business visa.

Give that NOC to your company which will apply a business visa and tell them to apply in immigration submit this NOC along with the other documents.

This has been done by one of my friend.