Moving a Customer Blog into ProSites

Hi Guys,

We have a Client with current installation of WP on their Website

http://www.domain.com/blog

1. We will create a pro-site account for him
2. We will map his domain at http://www.domain.com/blog and add proper Registrar records for it
3. How Do We migrate the design/plugin and content as is?

Please let me know if my assumptions are correct and all doable.

Thank you