Rates Sales Analyst Interview - Best way to Prep?

I have an interview at a BB coming up for a Rates Sales Analyst position. From the looks  of it, main and maybe only focus is US interest Rates products. Have experience in Fixed income sales already, but more across multiple fixed income products, not solely rates. Curious since its a sales role and  an analyst position, how in depth i should dive into the technical on Rates(only have experience in more vanilla rates coverage)? 

Any insight on how to best prepare, where I should spend most my time preparing for and what to expect for questions is really appreciated. 

Cheers!