I didn’t see where you mentioned what state the judgment was obtained in so obviously if it was Calif you don’t need a sister state judgment. ...

If it is a no asset case it won’t make any difference but you are supposed to list all creditors regardless

You can sue on oral contract for loss of the money but if you need to sell and she won’t sign you need to file a partition lawsuit

How do you seize an automobile in a judgment?

You need a writ and to have it levied by the sheriff. Due to exemption law, the high cost of the levy and the way most people finance their cars,...

To the extent the underlying debt is dischargeable, yes

Can I still try to seek a settlement ?

Both of course. You can expect to pay a total amount on sliding scale lump sum/ payments

Listing Unreported Past Due Child Support on Chapter 7 Forms?

It won’t make any difference either way

Not likely. Of course by filing bankruptcy now you may be giving the creditor info they didn’t have, which is your spouse’s name

You are asking about the case numbers. No there can’t be two different case numbers on one levy. You’ve been given variants of the same case...