Hi @warish, welcome to the Supernotes Community!
Technically we already have this using “Move”, just select text and then press /. to quick append that content to an existing card or write a new title to author a new card. We found it to be faster than using line breaks as you can title cards quicker this way.
Also see Excising / Split / Absorb cards for more about the opposite – absorbing cards, which we haven’t added yet.