Map domains so permalinks show domain not subdomain

Hi,

I would like to clarify something if I may.

I have a multisite setup with subdomains.
These have been mapped to the clients purchased domains and all is working well.

I noticed that my permalinks all show as the subdomain, for example:

http://disabilityservices.ampedmediaworks.com/2013/11/05/sample-post/

Am I able to change this so it reads:

http://abilitycare.org.au/2013/11/05/sample-post

Or does it even matter? I want to make sure that the sites and content are optimised for SEO purposes.

Thanks in advance.

Richard C