Is it possible to create your own parameter in GA?

Question

Google

Hello,
Is it possible to create a custom parameter (user_id) in ga in order to track the user's path.
I want to get something like
user_id reffer
1 (direct)
1 yandex
2 google
1 social: vk
2 (direct) through GA Query Explorer (api)
something like this

Answer 1

Yes, you create a custom dimension and pass user-id in it.
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