Change in Production Order after release to add additional production line

Hi,

Is it possible to change the production order after release ?

The scenario is as follows:

A production order (PO) has been release and it is utilizing "production line A" and time of completion id 5 days.

After release of PO, "production line B" becomes available due to any reason. And now we want to utilize the line with the same production order.

Can this be done. If Yes How?

Regards

Suhail