Performing one of the operation in other plant

Hi Experts,

In our organization, due to capacity constrains, few times some operations are done at other plant,

Say there are two plants 1000 & 2000 both are situated in differant states.

And there are 3 operations in a job (e.g. 10, 20, 30), the operation no. 10 done in plant 1000 but operation 20 will be done at plant 2000 for which we provides the semi finish material to plant 2000 along with few component to assemble it in to semi finished material.

Now after we get the material from plant 2000 we perform the opertaion no. 30 in plant 1000 again,

How we can map the same in SAP along with proper stock transfer between both plants.

Please suggest the solution,

Thanks,

Srinathan.