Domain mapping - displaying web address of mapped domain

I have created a multisite and installed domain mapping plugin for the multisite users to map their subsite to their own domains.

Lets say product1.mydomain.com is the subsite link and the client's domain is productsales.com and they already have an active website at productsales.com

If I want all the pages created in the subsite to have an address like either productsales.com/campaign/page1 or campaign.productsales.com/page1 how do I do it??