As a CR-1 immigrant, can I file I-407, Record of Abandonment of Lawful Permanent Status a week before my flight to home country?

There are new rules as to when and how to file the form. Visit www.uscis.gov and read them.

Is child support services required to follow child support statutes when modifying child support ?

I changed the practice area to Family s you could get answers.

I am waiting for H4 change of status in US, but J visa will got expired soon and need to leave, can switch to consular process?

No way to switch. You can initiate consular processing by filing DS 160.

Secondary Inspection in Port of Entry?

I already answered this quesiton for you in your previous post and also in the comments there. I am not sure what else can be said remotely.

Court Disposition Letter?

This is a good question to ask your local criminal defense attorney to opine on.

She can if this is what she would like to do and your marriage is bonafide.

Withdrew I-751. Went back to home country in December 2018. Still in Brazil. Will I be allowed to board flight back to USA?

You said you withdrew your removal of conditions application. On what basis then will you be coming to the USA?

Can expired and renewal rejected H1B be applied for renewal again?Does it involve visa interview in the home country again?

Theoretically you can use AC 21 rules to be petitioned by a new H1B employer using that old quota.

As a Canadian, can I work as a Food and Beverage Manager in a hotel in the States with a TN visa or H1B?

Provides this position is a specialty occupation which I doubt, you could.

How can I know my H1B transfer process occurred after premium processing upgrade or in normal processing?

I am not sure I understand the question. One would need to know more about that specific H1B petition and circumstances to opine.