Thanks for the manual - I made the mistake of trying to use the inbuilt help

I see that Avast randomly decides which machines in the catalog to give the license too.
It has 'randomly' given licenses to machines (and NAS drives) that I dont want to lose my licenses too. How can I move the license to other machines? Is it simply a case of deleting a computer/nas from the catalog that has a license, and it will automatically reallocate it to another machine?
Are 'unlicensed' machines still protected?
Thanks, Mark