going from 2AWG wires down to 14AWG
Taking a note from marlinespike seamanship, with a stranded cable you can split and rebraid the ends like you would rope.
You can braid a cat 'o nine tails from one fat cable, and terminate each end at your connectors

Now for a professional product you can have such a cable made for you custom, but if you are working with large stranded wire you can take a note from this 19th century tradition and make it yourself.
Roughly, split the cable, extract the strands, Seperate into 10 bundles , rebraid and insulate, zip ties above and below the joint for rigidity. The final cable may need to be derated relative to standard 2awg .