question on amending my return

Hi, 

I apologize if this is a duplicate. I posted a question earlier but I cannot find it nor have I gotten an email.

 

My question is as follow:

I just e-filed my 2020 return, after that I found out that I missed to import a tax document from my brokerage which includes 1099-DIV, 1099-B and Form 8949.

In my original return, I am getting a refund while in my amended return, I would need to make a payment.

 

When I looked at the PDF copy of the amended return, It looks like they payment I owe will be deducted from my refund, which is fine.

 

How does that exactly work?

Will this amended return supersede the first return I filed which means I will received a refund less of what I owe or will they send me the or will they send me the original amount and I'll just have to make a payment?

Also, can i e-file my California amended return using Turbotax?


I apologize, this is the first time I am doing this.