Can someone explain the immigration process for my parents

I am an Indian citizen who is in the process of applying for a greencard via EB1. So that should be about a year or so. Can someone explain to me how I get my parent (also Indian) to the country after I receive my PR. I keep reading conflicting information ranging from I can sponsor their PR as a PR to i cannot do that at all. In short, can I get an answer to following 1. Once I receive my PR, is there a way to bring my parent to the country long-term (more than 6 months on B visa), may or may not be PR route. 2. Can I sponsor my parent for a PR while Im on a PR? Or do I need to wait to be a citizen to be able to sponsor? Do they have to be in the US or India before I do that?

submitted by /u/imminoob
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source https://www.reddit.com/r/immigration/comments/o3hrmk/can_someone_explain_the_immigration_process_for/

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