As my company is growing, so is our website. The company management has decided to create a completely new website for one aspect of our business, that has been featured on the main site for years. We get high visibility on Google and most of other SE's on the search phrases that are important to us for this part of business. As this is my first time dealing with something like this, I am not sure how to proceed.
I don't want to create duplicate pages and duplicate content, as I know that is not a good idea. So, I will have to submit my new site to the SE's, and remove duplicate pages of the main site. But, then I will lose the search engine positions that I was so happy about. If I temporarily redirect old pages to the pages on the new site, is Google going to tolerate it?