Excise duty on internal consumption

The company has been engaged in the manufacturing of dutiable goods & exempted goods, dutiable goods are internally consumed for manufacturing of exempted goods.

At present we are availing of Cenvat credit on inputs of dutiable goods and utilised the same on removal of dutiable goods on following transaction;

1. Domestic Sales
2. Sample / Demo Sales
3. Captive Consumption
4. Control Sample etc

Now, we want to know that, what the procedure for below mentioned transaction is? Please suggest.

If we are not availing of Cenvat credit on inputs of dutiable goods then the duty applicable on following transaction on dutiable goods;

1. Sample / Demo Sales
2. Captive Consumption
3. Control Sample etc

Yes, we will pay the duty on Domestic Sales or Export Sales (if Export without Bond)