What is the best practice to handle this? You lose a deal. Maybe you want to follow up in 9 months. Is it better to markt the deal as lost or move it back to leads? Happy to learn about your best practices.
Its better to mark it as lost and create an activity to contact them again is whatever amount of time, 9 months, etc.
This largely depends on your sales process. We mark the Deal lost and Convert to a Lead and have our calling group start making calls again on the Lead at around 3 months out. Having a process that works for you is what makes the most sense, how does it fit into your overall sales process, who would you want following up on that lost Deal, etc.