I play BF4 on PC and now X1 how do I link?

I am lvl 62 on the pc with premium and was wondering how do I connect my xbox to my Pc?

You don't, you should use the same account for both.

I understand that I won't have the same levels and will have to start over but I heard I don't need to buy premium for multiple devices and would rather not do that in the first place.. 

Then you sadly heard wrong. Premium or anything else don't carry between platforms. So going from PC --> X1 = you starting from scatch with everything (except your ea account)

So I made a origin on the X1 because it wouldn't let me use my current one and couldn't do anything else if I didn't create a new id.

This should tell you how to link accounts: https://help.ea.com/article/linking-your-gamertag-psn-id-or-ea-classic-screen-name however if something went wrong you should contact EA as Answers HQ is a public forum where users help other users. This mean most of the people helping are users like yourself and thus we unfortunately cannot help with account and/or billing issues like this one. I would Instead suggest contacting an EA Advisor by going to https://help.ea.com/contact-us

You will have to write some keywords about your problem, then fill out product, category and platform, press “Find Solutions” and then “I Still Need Help”. Then your contact options will appear. If live chat/phone does not appear, it might be closed in your area at the moment and you might consider changing it to: “United States” or something else in the language selector in the bottom of the page for a better result.