Conditional Multisite Sub-domain Rewrite?

I’m currently using a complex multisite setup. I have site as the landing page/blog and another site for the main functionality. The subdomain of the main site is set to /dashboard/ so every other page that loads after has the dashboard slug in it. IE http://www.name.com/dashboard/post-a-project. I was wondering if there was a way to make the website appear as http://www.name.com/post-a-project while not interfering with the landing page site. This is mostly for aesthetic purposes.