Transfer licensed install to another computer

I have two 3-license subscriptions for NIS 2012.

 I just renewed subscription A, which has 2 licenses installed on active computers (computer 1 and computer 4), and the 3rd license was lost when a computer died.

Subscription B is about to expire.  This subscription also has two licenses installed on active computers (computer 2 and computer 5), and the 3rd license was lost when a computer died.

I need to do the following:

1. Move a subscription A license from computer 4 to computer 2 (computer 2 has a subscription B license installed) and retire computer 4.
2. Reactivate the lost license for subscription A, and install it on computer 3.
3.Retire computer 5, which has a subscription B license installed.