Sub SIte not updateing

I have setup the new blog template for my main site to replicate it to other subdomains for this site.

Issue i have is i make chaged to main site and it wont update on subsites, yes any new sites i create under it will replicate what is on it at that time.

I have footers for main site yet when i make chanes to main stte the subsites wont update.

mainsite http://www.project365.com.au

subsite http://www.project365.mobi.
site URL links wont update on sub menu ?

alternativly is there any way of relicating the site automaticly on a subsite so when one upates the other updates but have 2 diffrent domains ?

Ross