My company implemented a way of showing clients progress on their websites. We do this by implementing "development" subdomains (example - development20.oursite.com).
My question is, since Google is indexing these subdomains, does the fact that they are not necessarily credible have negative impact on our root domain?
We noticed a PR drop from 6 to 4 over the past year and this came to my mind but wasn't sure how subdomains affected the root domain.
Any thoughts are appreciated!