Material Valuation

At the moment, my material 'Chemical' has Price Control as 'V' with Moving average price as 100. Also there are no open documents with respect to the material. However there is a stock of 100.

How can I do the following:

1. Change the value of the stock from 100 unit price to 200?

2. Change the Moving average Price of the material from 100 to 200 when the price control is 'V'?

3. Change the price control from 'V' to 'S'?

4. Change the standard price of the material from 100 to 200 when the price control is 'S'?

5. To change back the price control from 'S' to 'V' when Moving average price is 100 and standard price is 200.

Thanks in advance.

vasudevarao p