sort a portion of a list of cells based on a variable

I have a list of names/indexes, along with a random number used for sorting....depending on the number of names, we'll divide them into flights. So I want to be able to sort the first X names based on the random seed (column C). Then sort the next X names based on the random seed, etc., etc. depending on the value in G2.

Example, if I have 40 names, 2 flights, I want the first 20 names sorted off the key in Col. C, then the next 20 names after that.

In this way, the flights are randomly drawn so that pairings are done randomly

Thanks for any help!
Mark

I discovered a simpler way to handle this situation using random keys and sorting. Thank for the answer and to anyone that thought about this.