Upgrade Of LS Retail 2009

Dear All,

I need to upgrade the LS Retail 2009 to latest version. What is the way to upgrade from LS retail 2009 to Nav 2015 or higher version? I have few questions which help me to understand the LS upgrade.

1. Do we have to merge LS retail objects with Navision ?
2. Do LS retail provide Navision database with merge LS retail objects?