As another user said, you can't do this anymore. I wouldn't worry about it because the only thing that transferred was character design, that's it. If you want your D2 character to look like your D1 character, you can create a new one in D2 and model it like your D1 character.
You cant. The copying of character looks/class/creation date etc happened once in August 2017; if your characters weren't copied into D2 you didn't meet the criteria for it at the time [quote]In preparation for Destiny 2, all existing Destiny accounts automatically underwent an Account and Character Migration process on August 1, 2017. This process prepared some of their character and game progression data to be imported into Destiny 2.[/quote] [quote]Character Requirements: For a Character's game progression to be recognized in Destiny 2, the Character must have reached at least Level 20 and must not have been deleted at the time of the Account and Character Migration.[/quote] https://help.bungie.net/hc/en-us/articles/360049199871-Legacy-Support-for-Destiny-1-FAQ