How to create a differencing vhd (natively)?

I want to learn/create a differencing disks natively for my main OS. I already installed my OS in the native VHD. Now i want to be pointed in the right direction on how to create a differencing disk. I need to know how to write lock my parent vhd then add my child vhd. How do i do that?

I did read from another post before this but did not answer but lead to another related question. First, i still want to learn this, learn by doing, but i do wonder after i create these and make a chain, just how do i break the chain and go back in time to another child? eg. SP2.vhd to SP1.vhd. This part may be answer by doing the first thing which is, how do i create a differencing vhd?? ,along with a chain of them.

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