A: You would have to reduce the cause of action to a judgement by filing a lawsuit and going through that process. This process will depend on the language in any contracts executed or if there was no contract the state procedural and conflict of law rules.
Once you have a judgement you would file a proof of claim in the Texas bankruptcy case. That would allow you to receive an allocable portion of any payment made to unsecured creditors.
A: In that scenarios there's a few different approaches to pursue the owners and the new entity. First LLC owners can be responsible for judgements against the LLC for amounts distributed form the LLC for a period of three years prior to dissolution. Second, this would likely be considered a fraudulent transfer. Both create liability for the owner/s individually, which is counter to the purpose of having an LLC in the first place. It's always a bad idea, but people do it.