Sales tax on input material used in job work process

Dear Sir, 

We are sending goods from Telangana to MP for Jobwork purpose. In the process of Jobwork our Jobworker need few other Rawmaterials which is exciable to compleate the task. The same Rawmaterials are available with the Jobworker and he is using the same in process. He is including the RM details in bill and charging Excise and sales Tax as well.

We would like to know whether we are liable to pay VAT or CST on those input RM's? (as they are using in the same state and not physically moving RM's to our state). If CST can we issue "C" form for the same? 

Please help with your inputs on the same.

Regards

Kishore