Can you change the primary domain name on Multisite after setup

Hi guys. So I finally got my wp-config.php file to transfer right (darn that "easy to forget" binary transfer option on FTP). I'm moving on to setting up sub-domains for multisite. Only thing is the domain I want for my main network is being hosted on another site and I need to move it over. Due to lots of files and other things, this might take awhile.

My question is...if I set up my sub-domains to: sub1.olddomain.com, can I later switch it to the new domain without many issues? Thought I'd better ask before I proceed.