Too Many Licenses No Activations

I have got a bit of a mess going and I need help to resolve it.  Basically, I have 5 PCs, 15 Licenses and no activations left.  There are three keys, each with 5 licenses.

 

I want to get to 5 PCs (stuck with that), 5 Licenses (1 key) with activations allocated 1 per PC.  I let one set of 5 licenses (1 key) expire so they have gone.  The second set expires in March and at least one system is using its key.  Two questions:

 

  1. How do I change the current key (just about to expire) to the other (target) key that I want to retain.  The source key is coming up for renewal and demanding I do so.
  2. All the activations have gone on the target key.  This is probably history as I only have 5 PCs.  How do I get these back again.

Help ... Nick