Salary from 2 employers, how to show in form 16 ?

every company will consider his own salary only, and issue TDS certificate / form 16/`16A accordingly, its the burden to the employee to pay additional tax / claim refund and file ITR

So what you are saying is to provide only the details pertaining to Emp B in the TDS Certificate to be issued by him and leave the rest to the employee ?
 

an employment means full time working with any company, simaltenous employment in more than one companies is barred ............ ( not explaining the complexity here)

so B will look into his own business only, and issue certificate for his part only, its upto employee to file return for multiple sources of salary and income.

Thank you sir for your kind help..