Could you write a script that makes it easy to set up table rates?

Currently I use multiple carriers, and each one has its own weight breaks and zones.

It is so much work to copy this into table rates. I would prefer to use live rates, however this doesn't work across various child accounts. Eg any customer ordering from x location , we return rates from child account A, and any customers order from post code range B we return live rates from child account B?

so I am forded to use table rates, but am wondering if there is an easier way to transfer the info from my excel spreadsheet rates from my carriers into your platform.