Yes. With Multi-Post, posts to main site and subdomains can go in either direction. I haven’t decided yet if I’m going to make all posts to the main site and trickle them down to the subdomains or if I’m going to continue posting to the subdomains and trickle them up to the main site.
It’s a bit of a logistical nightmare, because I’d really rather have the comments go on the subdomain post to keep the contributed information, in this case on a travel destination, on topic. I would also rather send the url of the subdomain post to social media sites like stumbleupon and twitter to spread out the traffic.
The plugin doesn’t work exactly like I expected – I expected a redirect/link of the post. So that if someone clicks on the post from the main page it would go to the one post on the subdomain. I thought it would just be the post-title, post-image and extract that would post to the main site.
The double comments thing just makes it even more confusing.
The other thing is that I have a Submission form on a page on the main site and I wanted to put the same page on each subdomain – but the form (of course) doesn’t go along with the page. Which then means that I have to create a different Submission page for each subdomain.